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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.
When you put on weight may be as important as the total tally of pounds. You should gain the least weight during the first trimester (roughly 2 to 5 pounds total) and steadily increase, with the greatest number of pounds (roughly a pound a week) coming in the third trimester, when the baby is growing the most.