Our baby is more than 11 inches long and weighs just over a pound. Her skin is red and wrinkled. Blood vessels in her lungs are developing to prepare her for breathing. She can swallow, but she normally won't pass his first stool (called meconium) until after birth. Loud noises heard often in utero — such as your dog barking or the roar of a vacuum cleaner — probably won't faze our baby when he hears them outside the womb.