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6 weeks
His emerging ears are marked by small depressions on the sides of the head, and his arms and legs by protruding buds. His heart is beating about 100 to 160 times a minute — almost twice as fast as yours. http://www.babycenter.com/6_your-pregnancy-6-weeks_1095.bc -
10 weeks
He's swallowing fluid and kicking up a storm. Vital organs — including his kidneys, intestines, brain, and liver (now making red blood cells in place of the disappearing yolk sac) — are in place and starting to function, though they'll continue to develop throughout your pregnancy. http://www.babycenter.com/6_your-pregnancy-10-weeks_1099.bc?intcmp=timeline -
12 weeks
Meanwhile, nerve cells are multiplying rapidly, and in your baby's brain, synapses are forming furiously. His face looks unquestionably human: His eyes have moved from the sides to the front of his head, and his ears are right where they should be. From crown to rump, your baby-to-be is just over 2 inches long (about the size of a lime) and weighs half an ounce.
http://www.babycenter.com/6_your-pregnancy-12-weeks_1101.bc -
16 weeks
His ears are close to their final position, too. The patterning of his scalp has begun, though his locks aren't recognizable yet. He's even started growing toenails. And there's a lot happening inside as well. For example, his heart is now pumping about 25 quarts of blood each day, and this amount will continue to increase as your baby continues to develop. http://www.babycenter.com/6_your-pregnancy-16-weeks_1105.bc?intcmp=timeline -
19 weeks
. Her arms and legs are in the right proportions to each other and the rest of her body now. Her kidneys continue to make urine and the hair on her scalp is sprouting. A waxy protective coating called the vernix caseosa is forming on her skin to prevent it from pickling in the amniotic fluid. http://www.babycenter.com/6_your-pregnancy-19-weeks_1108.bc?intcmp=timeline -
23 weeks
Blood vessels in her lungs are developing to prepare for breathing, and the sounds that your baby's increasingly keen ears pick up are preparing her for entry into the outside world. Loud noises that become familiar now — such as your dog barking or the roar of the vacuum cleaner — probably won't faze her when she hears them outside the womb. http://www.babycenter.com/6_your-pregnancy-23-weeks_1112.bc?intcmp=timeline -
27 weeks
She's sleeping and waking at regular intervals, opening and closing her eyes, and perhaps even sucking her fingers. With more brain tissue developing, your baby's brain is very active now. While her lungs are still immature, they would be capable of functioning — with a lot of medical help — if she were to be born now. http://www.babycenter.com/6_your-pregnancy-27-weeks_1116.bc?intcmp=timeline -
31 weeks
He can turn his head from side to side, and his arms, legs, and body are beginning to plump out as needed fat accumulates underneath his skin. He's probably moving a lot, too, so you may have trouble sleeping because your baby's kicks and somersaults keep you up. http://www.babycenter.com/6_your-pregnancy-31-weeks_1120.bc?intcmp=timeline -
33 weeks
This week your baby weighs a little over 4 pounds (heft a pineapple) and has passed the 17-inch mark. He's rapidly losing that wrinkled, alien look and his skeleton is hardening. The bones in his skull aren't fused together, which allows them to move and slightly overlap, thus making it easier for him to fit through the birth canal. http://www.babycenter.com/6_your-pregnancy-33-weeks_1122.bc?intcmp=timeline -
38 weeks
Hey, your little one isn't so little anymore, weighing close to seven pounds and measuring 20 inches long. Fetal development is nearly complete as your baby tends to a few last-minute details like shedding the skin-protecting vernix and lanugo. http://www.whattoexpect.com/pregnancy/week-by-week/week-38.aspx
