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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.
If you start out your pregnancy over or under-weight, you will want to talk with your health care provider about what your weight gain rate should look like. 1  1-4.5 pounds during the first trimester. 2  Approximately 1-2 pounds per week in the second trimester. 3  Approximately 1-2 pounds per week in the third trimester.