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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.
Weight gain is one of the key first trimester symptoms, and a pregnant woman should expect to gain an average of three to four pounds during the first three months of pregnancy. Every woman is different and her first trimester symptoms may not include everything described below.