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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 Pregnant women who are normal weight (BMI of 18.5 to 24.9) should gain between 25 and 35 pounds. 2  Pregnant women who are overweight (BMI of 25 to 29.9) should gain between 15 and 25 pounds.  Pregnant women who are obese (BMI greater than 30) should limit weight gain to between 11 to 20 pounds.