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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.
Soon, you will start to feel your baby move. The amount of weight you can expect to gain during the second trimester will vary based on your pre-pregnancy weight. Your doctor should calculate your body mass index (BMI) early in your pregnancy. Based on your BMI, your doctor can estimate how much weight you should gain. According to the Institute of Medicine, women who are: underweight, or have a BMI under 18.5, should gain 28-40 pounds.