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This week marks a major milestone in your baby's hearing and sight. Your baby's hearing system (cochlea and peripheral sensory end organs), which began fine development during week eighteen, is now completely formed, and over the next few weeks, he'll become increasingly sensitive to sound. In about a month, you'll feel him jump if he hears a sudden loud noise. Sound passes easily into your uterus, which helps his ears develop. His eyes are almost fully formed. Did you know that all babies have blue eyes in the womb, no matter what their genetic inheritance is? A baby's eyes don't get their final color until a few months after they are born. The air sacs of the lungs, called alveoli, will be developed by the end of this week and will begin to secrete a substance called surfactant that keeps the lung tissue from sticking together.
Between now and week 29 your baby will have a growth spurt and gain another pound. As your baby grows, space gets tighter inside the womb. Your baby now measures about 12.8 inches tall and probably weighs almost 2 pounds.
Most of this weight is bone and tissue because he still doesn't have much body fat. In fact the main development of body fat doesn't really occur until late in the third trimester.
Developments that occur this week:
- Eyelashes. These begin to grow as your baby begins to blink and open his eyes.
- More hair. Hair continues to grow on his head.
- Spine. To support his growing body, your baby’s spine is getting stronger and more flexible.
- Plumping up. Although he hasn't put on much fat, he is beginning to look a little plumper.
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