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Weeks 26 to 32. During the first six weeks of the third trimester, your baby will more than double in sizeâgrowing from approximately 1.5 to 3.5 pounds. He will also grow in length from about 14 inches to almost 17 inches. The baby's growth during this period is an important indicator of his health.
The seventh, eighth, and ninth months are the third and final trimester of pregnancy. For more information on development, use the drop down menus above or the weeks links below. 27 weeks-The fetus weighs now just over 2 pounds and is about 14 inches long. The baby's eyes begin to open around this time. 28 weeks-The fetus has his own regular intervals for sleeping and being awake. It also opens and closes its eyes and may suck a thumb. 29 weeks-Your baby now weighs about 2 1/2 pounds and is about 15 inches long from head to heel.