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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.
There are no official UK guidelines for how much weight you should gain over your pregnancy. There is only general advice that most women put on somewhere between 10kg and 12.5kg (22lb to 28lb) (NHS 2011) . You'll gain most of the weight after 20 weeks (NHS 2011) .y the end of your pregnancy, you may weigh about 12.5kg (27.6lb) more than you did before you were pregnant (Murray and Hassall 2014:166) . This varies from person to person, so check out our pregnancy weight gain estimator to get a more personal figure based on your own height and pre-pregnancy weight.