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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 third trimester is mainly a time of weight gain for the baby. During this time the baby can open and close its eyes, sleep, and typically gain weight at a rate of half a pound per week. In the weeks leading up to birth, most babies will grow to be 6 to 9 pounds and 19 to 21 inches long.