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Pregnancy & Baby Development: Weeks: 28-31

By the dawn of the third trimester of your pregnancy, the end is in sight and you are anxious to meet your little one in person. Of course, she still has some growing and developing to do before that can happen. Even so, tracking your baby's development week by week helps you understand the rapid changes your baby is undergoing to get ready for her big debut.

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Week 28

At 28 weeks, your baby weighs around 2 1/4 pounds and measures about 10 inches. As he gains weight, his skin stretches out, becoming less wrinkly. His eyes fully form, and his eyelids begin to open. His lung development makes progress. His eyelashes and eyebrows are growing in, along with hair. He gains additional fat layers for insulation, as well as muscle tissue and bone.

Week 29

During week 29, your baby's bones develop fully, although they remain soft, and her head and body grow into proper proportions to one another as more fat layers develop. She weighs about 2 1/2 pounds and measures around 15 inches long. Her brain starts controlling breathing and body temperature. Her eyes can move in their sockets and she starts to notice differences in light, sound, taste and smell. At this point, talking to your baby will familiarize her with your voice to promote her feeling of safety and security after birth.

Week 30

In week 30, your baby faces his environment with eyes wide open most of the time, and his tear ducts can produce real tears. He likely sports a good head of hair by now, and his bone marrow begins to form red blood cells. His toenails are almost done growing. He weighs around 3 pounds and measures approximately 10 1/2 inches in length. He starts to mimic breathing movements, and you may feel the rhythm of his hiccups.

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Week 31

This week marks the rapid gains in the maturity of the nervous system. The baby now measures about 16 inches and weighs about 3 1/4 pounds. From this point on, she will gain more weight than height each week. Her body is storing calcium, phosphorous and iron to harden the bones. Her lungs are continuing to develop to help her learn to breathe on her own. If you play music for her at this stage, you may notice that she will dance along to the rhythm.

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