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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.
Second and Third Trimester. It is normal for pregnant women in their second or third trimester to be hungrier because their baby needs more fuel to develop at this stage. You will need an average of 300 extra calories a day to gain weight at a healthy pace while supplying enough energy to your growing baby. You can calculate your daily calorie need for these trimesters simply by adding an extra 200 calories a day compared to what you were eating during the first trimester.