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•The embryo grows from a tiny speck about 2mm - the size of a pin head.
•By the end of the week the embryo will have more than doubled in size to about 4-5mm. -
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Twenty-five weeks into your pregnancy, or 23 weeks after conception, your baby's hands and startle reflex are developing. Your baby might be able to respond to familiar sounds, such as your voice, with movement.
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Twenty-six weeks into your pregnancy, or 24 weeks after conception, your baby has fingernails. Your baby's lungs are beginning to produce surfactant, the substance that allows the air sacs in the lungs to inflate — and keeps them from collapsing and sticking together when they deflate. By now your baby might be 9 inches (230 millimeters) long from crown to rump and weigh nearly 2 pounds (820 grams).
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Although your baby's lungs aren't fully formed, he or she practices breathing. Your baby's body begins absorbing vital minerals, such as iron and calcium from the intestinal tract.
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Thirty-four weeks into your pregnancy, or 32 weeks after conception, your baby's fingernails have reached his or her fingertips. By now your baby might be nearly 12 inches (300 millimeters) long from crown to rump. The pasty white coating that protects your baby's skin — the vernix caseosa — is about to get thicker.
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Thirty-seven weeks into your pregnancy, or 35 weeks after conception, your baby will be considered full term. Your baby's organs are ready to function on their own. To prepare for birth, your baby's head might start descending into your pelvis. If your baby isn't head down, your health care provider will talk to you about ways to deal with this issue.
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