later development. at ~ 8 weeks > fetus human gestation 38 weeks (from conception)
DESCRIPTION
Do not copy these notes on later development to 2 inches long heart has divided into right and left chambers.TRANSCRIPT
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Later Development
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• at ~ 8 weeks > fetus
• human gestation 38 weeks (from conception)
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Do not copy these notes on later development.....
1 to 2 inches long
heart has divided into right and left chambers.
![Page 4: Later Development. at ~ 8 weeks > fetus human gestation 38 weeks (from conception)](https://reader033.vdocument.in/reader033/viewer/2022051303/5a4d1b557f8b9ab0599a9270/html5/thumbnails/4.jpg)
3 inches long
organs and muscles beginning to function
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baby is covered with a layer of thick, downy hair called lanugo (La nu go).
heartbeat can be heard clearly.
baby's first kicking.
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lungs are filled with amniotic fluid
breathing motions begin.
can hear sounds.
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turned head down in preparation for birth
4 - 5 pounds
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6 - 8 pounds
18-22 inches
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Stages of Childbirth
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1. Dilating Stage
• the uterus contracts mildly at first then strongly and regularly (early and active labour).
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• cervix dilates with each contraction, and the baby’s head rotates to fit through the mothers pelvis.
• leads to a transition phase of intense contractions and full dilation of the cervix
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2. Expulsion stage• the mother pushes, or bears down, in
response to pressure against her pelvic muscles.
• baby’s head becomes visible
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• babys shoulders, which emerge one at a time with the next contractions. The rest of the body then slides out relatively easily
• the umbilical cord is sealed and cut.
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3. Placental stage
• within ten minutes of the baby’s birth.
• uterus continues to contract, expelling the severed umbilical cord and placenta.
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