PSY 235 : Prenatal Development and Birth

00:14:22
https://www.youtube.com/watch?v=z3QsUew3rUU

Summary

TLDRThis chapter explores prenatal development and birth, detailing the germinal, embryonic, and fetal periods. The germinal period involves rapid cell division and the formation of the placenta. The embryonic period sees the development of basic body structures, including the neural tube, which becomes the brain and spinal cord. The fetal period is characterized by significant growth and maturation of the fetus, including the development of sex organs and brain structures. The chapter also discusses the impact of teratogens on development, the importance of maternal health, and the role of fathers in supporting the family. Newborn reflexes and the significance of bonding between parents and infants are also covered.

Takeaways

  • ๐Ÿ‘ถ Three main periods of prenatal development: germinal, embryonic, fetal.
  • ๐Ÿงฌ Teratogens can cause birth defects and complications.
  • ๐Ÿผ Newborns have reflexes for oxygen, temperature, and feeding.
  • ๐Ÿคฐ Maternal health significantly affects birth weight.
  • ๐Ÿ‘จโ€๐Ÿ‘ฉโ€๐Ÿ‘ง Fathers play a crucial role in supporting maternal health.
  • ๐Ÿง  Neurogenesis is the formation of new neurons during development.
  • ๐Ÿ’” Postpartum depression can affect mothers after childbirth.
  • ๐Ÿค Parental alliance is key for cooperative child-rearing.
  • ๐Ÿ‘ถ Skin-to-skin contact is beneficial but not essential for bonding.
  • ๐Ÿ“‰ Low birth weight can result from maternal malnutrition or drug use.

Timeline

  • 00:00:00 - 00:05:00

    This chapter discusses prenatal development, which is divided into three main periods: the germinal period (first two weeks), the embryonic period (third to eighth week), and the fetal period (ninth week until birth). The germinal period involves rapid cell division and the formation of the placenta, while the embryonic period sees the development of the neural tube, which becomes the brain and spinal cord, along with the formation of basic body structures. The fetal period is characterized by significant growth and maturation of the fetus, including the development of sex organs and the brain, which is the largest part of the body at birth.

  • 00:05:00 - 00:14:22

    The chapter also addresses factors that can harm prenatal development, such as teratogens, which are agents that can cause birth defects. Behavioral teratogens can impair a child's future intellectual and emotional functioning. The discussion includes the impact of maternal behavior, such as health and nutrition, on birth weight, as well as the father's indirect influence on the baby's health. Finally, the chapter highlights the importance of reflexes in newborns for self-protection and the role of both parents in supporting the newborn and each other, emphasizing the significance of parental alliance and bonding.

Mind Map

Video Q&A

  • What are the three main periods of prenatal development?

    The three main periods are the germinal period (first two weeks), the embryonic period (third to eighth week), and the fetal period (ninth week until birth).

  • What is a teratogen?

    A teratogen is any agent or condition, including viruses and drugs, that can result in birth defects or complications during prenatal development.

  • What are some reflexes newborns have?

    Newborns have reflexes for maintaining oxygen (breathing, sneezing), body temperature (crying, shivering), and feeding (sucking, rooting).

  • How can a father's behavior affect prenatal development?

    A father's behavior can indirectly influence prenatal development through his attitude, support, and the relationship dynamics with the mother.

  • What is postpartum depression?

    Postpartum depression is a condition that may affect mothers after childbirth, characterized by sadness and feelings of inadequacy.

  • What is parental alliance?

    Parental alliance refers to the commitment by both parents to cooperate in raising their child.

  • What is neurogenesis?

    Neurogenesis is the formation of new neurons during brain development.

  • What is the significance of skin-to-skin contact for bonding?

    While early skin-to-skin contact is beneficial, it is not essential for bonding; other interactions like feeding and talking are also important.

  • What factors can affect a baby's birth weight?

    Maternal health, illness, drug use, and malnutrition can all affect a baby's birth weight.

  • What happens during the fetal period?

    During the fetal period, the fetus grows in size, matures, and develops organs and systems, including the brain and heart.

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    in this chapter we will begin to look at
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    developmental phases and a more interest
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    more specifically we'll be taking a look
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    at prenatal development and birth so
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    there are three main periods of prenatal
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    development there's what's called the
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    germinal period that's usually the first
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    two weeks after conception usually you
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    know there's rapid cell division
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    beginning of cell differentiation etc
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    there's also at the embryonic period
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    that's a third to the eighth week and
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    that's the that's when the basic forms
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    of all the body structures begin to
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    develop and finally there is the fetal
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    period that's the ninth week until birth
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    and that's when the fetus grows in size
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    and matures and functioning so we'll
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    take a little bit more in depth here
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    exploration here of the germinal period
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    that's the first 14 days and so that's
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    what the zygote begins duplication and
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    division within hours of conception so
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    it begins basically immediately
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    fundamentally immediately that's when
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    there's development of the placenta
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    there's what's known as implantation
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    that's usually about ten days after
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    conception that's when the baby actually
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    begins to attach to the you know to the
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    parts of the mother and then that's when
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    the organism begins to grow rapidly then
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    we'll take a look at the embryonic
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    period remember that's from the third
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    week through the eighth week and that's
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    when the embryo that's basically their
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    neural tube begins to form and that is
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    the neural tube that actually becomes
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    the brain and the spinal cord and that's
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    what's known as the brain in the spinal
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    cord are known as the central nervous
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    system here they just have the CNS to
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    make that shorter but that's what that
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    refers to and a couple other things that
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    happen in that phrase of development you
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    know the head begins to take shape the
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    the eyes ears nose in malformed heart
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    begins to pulse
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    and the extremities develop you know so
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    that's basically the fingers and toes
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    they actually separate and so the you
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    know development really is beginning to
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    happen pretty rapidly from the third
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    week through the eighth week now this
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    just kind of shows you some some example
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    photos here from that embryonic period
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    here we'll take a look at the fetal
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    period now remember the fetal period
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    that's the ninth week after conception
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    until birth so basically during that
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    period that's when the genitals form the
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    sex chromosomes cause differences in
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    brain organization so and then it was
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    called cephalocaudal and proxy proximal
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    distal growth and basically that just
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    means cephalocaudal just refers to
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    growing from the head down so and then
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    proxied prรณximo distal growth that
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    refers to you know the limbs of the
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    individual and the heartbeat becomes
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    detectable the cortex is not fully
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    mature at birth you know so the brain
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    you know you know is the the cortex is
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    not fully mature although they do
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    mention that the brain at birth is the
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    biggest part of the body and that refers
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    to that term cephalocaudal that means
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    from the top down from the brain down so
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    here's just you know an image here
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    here's a actual photo here of a fetus
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    and you can see how well-developed it is
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    the face you know the you know the eyes
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    the nose everything is pretty rapid
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    growth through that so we'll move on so
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    the middle three months of the fetus you
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    know that's when the digestive and
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    excretory system is developed that's
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    when the the individual starts to
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    develop fingernails toenails buds for
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    teeth hair grows including eyelashes and
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    in the middle three months here you know
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    part two you know
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    we're gonna take a look at brain growth
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    and so the brain is experiencing very
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    very rapid growth so a profit follows
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    the sequence from the brain stem to the
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    midbrain to the cortex that's called the
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    proximal distal from the outward working
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    its way in so during that phase the baby
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    develops many new neurons
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    that's called neurogenesis that's the
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    formation of new neurons and synapses so
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    that is also called synaptogenesis you
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    do not have to memorize that but I would
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    recommend definitely memorizing the term
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    neurogenesis that is what's important
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    the formation of new neurons and this
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    just shows the development you know the
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    prenatal growth of the brain I just
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    included this chart here just for you to
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    examine on your own for further insight
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    now during the last three months of the
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    fetal phase does that expose you know
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    expansion and construction of lungs
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    final maturation of the heart valves the
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    arteries and veins and extensive growth
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    and folding of the cortex so at birth
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    what happens is the fetal brain actually
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    sends signals that release hormones in
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    the mother to trigger the females
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    uterine muscles so it's actually the
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    baby's brain that triggers and it
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    basically tells the mother I am ready to
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    be born now and let's start the process
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    and so that actually triggers the
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    female's uterine muscles so that's
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    usually when labor begins
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    okay and so we're gonna move on and
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    start talking about well you know what
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    kind of things you know can be harmful
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    to development or a growth during these
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    phases we've talked about and so there's
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    harmful substances and the what's
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    important here is this term right here
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    called teratogen x' and teratogen czar
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    basically any agent or condition
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    including viruses and drugs that result
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    in birth defects or complications so
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    basically just harmful substances you
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    know that can result in birth defects or
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    complications in human development now
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    another important thing to you know is
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    to know that there are what's known as
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    behavioral teratogen x' and what's that
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    those are the same thing you know agents
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    and conditions that can harm the
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    prenatal brain impairing the future
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    child's intellectual and emotional
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    functioning so that is important to know
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    on this slide right here okay so how
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    much stress you know risk analysis you
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    know how much is too much you know of
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    teratogen x' you know that kind of thing
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    how much is too much that can actually
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    cause these effects in a a baby that's
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    in prenatal phase so they use right here
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    right here i'm gonna skip the threshold
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    effect you know we just want to know
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    basically you know the threshold how
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    much is too much and you know for so for
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    example you know heavy drinking heavy
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    smoking those kinds of things can affect
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    prenatal development so and then there's
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    innate vulnerabilities and if you
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    remember from the previous chapter you
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    know genetic type information you know
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    can definitely affect you know if they
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    basically exercised themselves or
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    whatever those can create vulnerable
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    situations for the growing baby so right
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    here just just really quickly you know
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    male fee
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    you know they're more vulnerable to
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    trajans and female ones don't know why
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    that is
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    but it's just just was discovered in
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    research and then another thing you know
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    as mother's genes you know they can
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    affect the prenatal environment she
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    provides so remember genetic you know
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    information that's passed from parents
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    to their children
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    you know those can definitely affect
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    growth and development and last but not
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    least you know there's neural tube
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    defects remember neural tube that
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    becomes the brain and spinal cord you
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    know has been determined that are a
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    little more common in certain ethnic
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    groups you know and they may list a few
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    of them here I don't expect you to
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    memorize that I just wanted to make you
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    aware of that
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    okay so we're going to take a look at
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    low birth weight and the mother so first
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    of all there's maternal behavior
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    mother's behavior and so them the
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    mothers you know health illness drug use
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    before and during pregnancy those you
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    know all the can affect the baby's birth
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    weight and another thing too is the
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    maternal malnutrition or the you know
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    the mother not being adequately
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    receiving nutrition so that can
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    definitely affect the birth weight of
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    the baby as well and for those of you
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    are wondering well what about the father
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    you know so that's more of an indirect
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    influence of risk for adverse of birth
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    outcomes you know so some some things
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    that can affect the health and wellness
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    of the mother and the baby that she is
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    carrying you know you know it can be the
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    father's attitude the father's behavior
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    and the relationship between the mother
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    and father you know how much stress is
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    involved how much support all those
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    affect the health of the baby okay now
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    we're going to take a look at the new
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    family you know the newborn you know so
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    basically you know newborns they seek to
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    protect themselves with three sets of
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    reflexes so first of all they strive to
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    maintain oxygen through
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    beep breathing hiccupping sneezing etc
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    then the second reflex is constant body
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    temperature so things like crying
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    shivering tucking legs to the body
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    pushing all those are a result of
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    striving to maintain a regular constant
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    body temperature now finally the last
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    reflexes was feeding and that can be
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    sucking rooting swallowing so those
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    three reflexes right there for newborns
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    are extremely important for the baby you
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    know as important functions for the baby
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    to protect themselves and you know in
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    new families you know mothers you know
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    about half of all women may experience
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    you know physical problems after birth
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    you know so that can also be you know
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    things like postpartum depression you
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    know that's biologically based here and
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    it can result in you know psychological
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    type processes but it can be
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    biologically based you know and they
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    talk about some of the symptoms you know
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    postpartum depression you know like
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    sadness inadequacy etc etc you know may
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    not be able to actually adequately care
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    for the baby and so there's you know
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    varied causes for that you know there
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    isn't one hard fast rule for that it's
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    just a lot of it can demand on you know
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    the bio psycho and social type factors
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    ok now we're going to take a look at the
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    father's so not only fathers but the
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    entire social network and culture are
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    crucial influences on the health of the
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    new family so in the father's role you
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    know helping the mother stay healthy
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    helping mother manage stress you know
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    that affects the fetus providing legal
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    acceptance you know of the birth you
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    know that's another important thing too
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    so those are just a few factors that
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    that are important factors that the
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    father contributes to the
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    overall health of a new family also here
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    there's just a term that's you know
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    fairly important called parental
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    alliance and that just means basically
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    you know commitment by both parents to
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    cooperate and raising the child and
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    we'll take a look here you know parent
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    infant bonding and so remember bonding
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    that and that includes strong connection
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    broadening means a strong loving
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    connection and in you know it basically
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    forms when parents hold examine feed the
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    newborn and you know it's interesting
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    they mention you know but early
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    skin-to-skin contact is not essential
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    for human bonding you know can be the
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    other factors as well you know like
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    feeding examining you know looking at
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    interacting talking you know making
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    sounds all those are important for human
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    bonding so that ends our discussion here
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    so please immediately get your study
  • 00:14:14
    guide for this chapter and begin to
  • 00:14:16
    answer its questions and we will see you
  • 00:14:20
    at the next chapter
Tags
  • prenatal development
  • germinal period
  • embryonic period
  • fetal period
  • teratogens
  • neurogenesis
  • postpartum depression
  • parental alliance
  • newborn reflexes
  • bonding