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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.
Generally speaking, women need to increase their caloric intake by 340 kcal/day during the second trimester and 450 kcal/day during the third for a singleton pregnancy, according to the IOM. As with total weight gain, a womanâs rate of weight gain during the second and third trimesters is based on her prepregnancy BMI. Table 3 offers a summary of suggested rates of weight gain for a singleton pregnancy. The IOM report does not provide information about weight gain rates for twin pregnancies.