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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.
Healthy weight (BMI of 18.5 to 24.9): If your pre-pregnancy weight was in the healthy range for your height when you conceive, you should gain between 25 and 35 pounds. For the optimal growth of your baby, aim to put on 1 to 5 pounds in the first trimester and about 1 pound per week for the rest of your pregnancy. Underweight (BMI below 18.5): If you were underweight for your height, you should gain 28 to 40 pounds.