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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.
âDuring the first trimester, you should gain a negligible amount of weight, about 5-10% of your total weight gain for the entire pregnancy. Some even lose weight because of vomiting and nausea.â Experts recommend an average of an additional 150-200 calories per day during this time when babyâs on board. Second and third trimesters You can rack up 300 extra calories per day, if youâre under or average weight, during the last two thirds of your pregnancy. âThe second trimester is when weight gain really begins, totaling about 30% of overall weight gain,â says Dr. Weinreb. âDuring the third trimester, a total of 50%+ of weight gain should occur.â Adding up the numbers