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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):
1 Keep your weight gain within the recommended range: Women at a normal weight are encouraged to put on between 25 and 35 pounds during pregnancy. 2  Generally, you should gain only a few pounds in the first trimester and about 1 pound per week for the rest of your pregnancy.