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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.
By the end of the third month (which marks the beginning of the second trimester), your baby bump may start to grow as your unborn child packs on the pounds, doubling weight over the next 4 weeks so by the end of the second trimester (6 months) your fetus will weigh approximately 2 pounds.