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Week 6: The neural tube closes
Fetal development four weeks after conception
Growth is rapid this week. Just four weeks after conception, the neural tube along your baby’s back is closing. The baby’s brain and spinal cord will develop from the neural tube. The heart and other organs also are starting to form.
Structures necessary to the formation of the eyes and ears develop. Small buds appear that will soon become arms. Your baby’s body begins to take on a C-shaped curvature.
Week 7: Baby’s head develops
Fetal development five weeks after conception
Seven weeks into your pregnancy, or five weeks after conception, your baby’s brain and face are growing. Depressions that will give rise to nostrils become visible, and the beginnings of the retinas form.
Lower limb buds that will become legs appear and the arm buds that sprouted last week now take on the shape of paddles.
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Development of the Fetus and Placenta
At the end of the 8th week after fertilization (10 weeks of pregnancy), the embryo is considered a fetus. During this stage, the structures that have already formed grow and develop. The following are markers during pregnancy:
By 12 weeks of pregnancy: The fetus fills the entire uterus.
By about 14 weeks: The sex can be identified.
By about 16 to 20 weeks: Typically, the pregnant woman can feel the fetus moving. Women who have been pregnant before typically feel movements about 2 weeks earlier than women who are pregnant for the first time.
By about 24 weeks: The fetus has a chance of survival outside the uterus.
The lungs continue to mature until near the time of delivery. The brain accumulates new cells throughout pregnancy and the first year of life after birth.
As the placenta develops, it extends tiny hair like projections (villi) into the wall of the uterus. The projections branch and rebranch in a complicated treelike arrangement. This arrangement greatly increases the area of contact between the wall of the uterus and the placenta, so that more nutrients and waste materials can be exchanged. The placenta is fully formed by 18 to 20 weeks but continues to grow throughout pregnancy. At delivery, it weighs about 1 pound.
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