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You can also work out your BMI using our calculator. 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). See below for average weight gain (IOM 2009):
One-fifth of pregnant women in the United States are obese, and more and more doctors are advising them to watch their weight if they want an easy pregnancy and a smooth delivery. In May, the Institute of Medicine issued guidelines lowering the minimum recommended weight gain for obese women to 11 pounds, from 15. Now, a large four-year trial called the Healthy Moms study is going further, trying to keep obese pregnant women from gaining any weight at all. If they do gain weight, researchers want it limited to 3 percent of their baseline weight, about 5 pounds for a woman who weighs 170 pounds.