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Week 6
Your baby's jaw, cheeks, chin, eyes, ears, and nose are beginning to form what will eventually become one adorable face. In addition, her kidneys, liver, and lungs are developing, and her heart is now beating 80 times a minute (and getting faster every day). All this and she's still no bigger than the length of a nail head (about a quarter of an inch) from crown to rump!
http://www.whattoexpect.com/pregnancy/week-by-week/week-6.aspx -
Week 9
Your baby, now the size of a green olive, has grown about an inch since last week. Tiny muscles are beginning to form, so while he might not be ready to pump iron, he's gearing up to move his arms and legs. It's still too soon to feel anything in your belly, but you might be able to hear something at your next checkup. Try listening for your baby's heartbeat via a Doppler device — that welcome sound should be audible anytime now.
http://www.whattoexpect.com/pregnancy/week-by-week/week-9.aspx -
Week 12
The most dramatic development this week: reflexes. Your baby's fingers will soon begin to open and close, his toes will curl, his eye muscles will clench, and his mouth will make sucking movements
http://www.babycenter.com/6_your-pregnancy-12-weeks_1101.bc -
Week 16
Right now, he's about the size of an avocado: 4 1/2 inches long (head to rump) and 3 1/2 ounces. His legs are much more developed, his head is more erect than it has been, and his eyes have moved closer to the front of his head. His ears are close to their final position, too. The patterning of his scalp has begun, though his locks aren't recognizable yet. His heart is now pumping about 25 quarts of blood each day.
http://www.babycenter.com/6_your-pregnancy-16-weeks_1105.bc -
Week 20
Your baby weighs about 10 1/2 ounces now. He's also around 6 1/2 inches long from head to bottom and about 10 inches from head to heel — the length of a banana. (For the first 20 weeks, when a baby's legs are curled up against his torso and hard to measure, measurements are taken from the top of his head to his bottom — the "crown to rump" measurement. After 20 weeks, he's measured from head to toe.) -
Week 24
Your baby's growing steadily, having gained about 4 ounces since last week. That puts him at just over a pound. Since he's almost a foot long (picture an ear of corn), he cuts a pretty lean figure at this point, but his body is filling out proportionally and he'll soon start to plump up. His brain is also growing quickly now, and his taste buds are continuing to develop.
http://www.babycenter.com/6_your-pregnancy-24-weeks_1113.bc -
Week 26
The network of nerves in your baby's ears is better developed and more sensitive than before. He may now be able to hear both your voice and your partner's as you chat with each other. He's inhaling and exhaling small amounts of amniotic fluid, which is essential for the development of his lungs. These so-called breathing movements are also good practice for when he's born and takes that first gulp of air.
http://www.babycenter.com/6_your-pregnancy-26-weeks_1115.bc -
Week 30
Your baby's about 15.7 inches long now, and she weighs almost 3 pounds (like a head of cabbage). A pint and a half of amniotic fluid surrounds her, but that volume will decrease as she gets bigger and takes up more room in your uterus. Her eyesight continues to develop, though it's not very keen; even after she's born, she'll keep her eyes closed for a good part of the day.
http://www.babycenter.com/6_your-pregnancy-30-weeks_1119.bc -
Week 33
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. (The pressure on the head during birth is so intense that many babies are born with a conehead-like appearance.)
http://www.babycenter.com/303_33-weeks_1615716.bc -
Week 38
The Baby weighs about 6.8 pounds and she's over 19 1/2 inches long (like a leek). It has a firm grasp, which you'll soon be able to test when you hold her hand for the first time! The babys organs have matured and are ready for life outside the womb.
http://www.babycenter.com/6_your-pregnancy-38-weeks_1127.bc
