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When Should I Gain the Most? Although no two women are going to gain weight at exactly the same rate, there are some guidelines to follow: In the first trimester, you should gain 3.5 pounds if you're of normal weight. Underweight women need to gain 5 pounds, while overweight women should gain just 2. In the second and third trimesters, your weight gain begins to speed up. An average-weight woman will gain about a pound a week between weeks 14 and 28.
Ask your health care provider how much weight you should gain. A woman who was average weight before getting pregnant should gain 25 to 35 pounds after becoming pregnant. Underweight women should gain 28 to 40 pounds. And overweight women may need to gain only 15 to 25 pounds during pregnancy. In general, you should gain about 2 to 4 pounds during the first three months you're pregnant and 1 pound a week during the rest of your pregnancy. If you are expecting twins you should gain 35 to 45 pounds during your pregnancy. This would be an average of 1 Â½ pounds per week after the usual weight gain in the first three months. It's especially important to gain the right amount of weight when you're expecting twins because your weight affects the babies' weight.