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Week 6
The nose, mouth, and ears form. His heart is beating about 100 to 160 times a minute. The baby is a quarter of an inch long. http://www.babycenter.com/6_your-pregnancy-6-weeks_1095.bc -
Week 8
Webbed fingers and toes are poking out from your baby's hands and feet, his eyelids practically cover his eyes, breathing tubes extend from his throat to the branches of his developing lungs, and his "tail" is just about gone. http://www.babycenter.com/6_your-pregnancy-8-weeks_1097.bc -
Week 10
Vital organs, including his kidneys, intestines, brain, and liver are in place and starting to function. Tiny nails forming on fingers and toes and peach-fuzz hair beginning to grow on tender skin. http://www.babycenter.com/6_your-pregnancy-10-weeks_1099.bc -
Week 15
Baby now measures about 4 inches long and weighs in at about 2 1/2 ounces. Baby is busy moving amniotic fluid through her nose and upper respiratory tract, which helps the primitive air sacs in her lungs begin to develop. Her legs are growing longer than her arms now, and she can move all of her joints and limbs. http://www.babycenter.com/6_your-pregnancy-15-weeks_1104.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.He's swallowing more these days, which is good practice for his digestive system. http://www.babycenter.com/6_your-pregnancy-20-weeks_1109.bc -
Week 23
She's more than 11 inches long and weighs just over a pound. Blood vessels in her lungs are developing to prepare for breathing. http://www.babycenter.com/6_your-pregnancy-23-weeks_1112.bc -
Week 26
The network of nerves in your baby's ears is better developed and more sensitive than before. He's inhaling and exhaling small amounts of amniotic fluid, which is essential for the development of his lungs. And he's continuing to put on baby fat. He now weighs about a pound and two-thirds and measures 14 inches. http://www.babycenter.com/6_your-pregnancy-26-weeks_1115.bc -
Week 30
Baby's about 15.7 inches long now, and she weighs almost 3 pounds. Her eyesight continues to develop, though it's not very keen. 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 the uterus. http://www.babycenter.com/6_your-pregnancy-30-weeks_1119.bc -
Week 35
His kidneys are fully developed now, and his liver can process some waste products. Most of his basic physical development is now complete — he'll spend the next few weeks putting on weight. http://www.babycenter.com/6_your-pregnancy-35-weeks_1124.bc -
Week 40
His skull bones are not yet fused, and he weighs about 7 1/2 pounds. Also, he is about 20 inches long. http://www.babycenter.com/6_your-pregnancy-40-weeks_1129.bc
