Week 15: What's Happening

Your growing baby now measures about 4 inches long, crown to rump, and weighs in at about 2 1/2 ounces, about the size of a naval orange. She's 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. Although her eyelids are still fused shut, she can sense light. If you shine a flashlight at your tummy, for instance, she's likely to move away from the beam. There's not much for your baby to taste at this point, but she is forming taste buds. So what keeps your baby busy all day? Mostly, she is in rehearsals — practice, practice, practicing, and getting ready for that big debut. Babies practice breathing, sucking, and swallowing so that when they leave your comfy womb and move into your comfy house, they'll have the skills necessary to survive.