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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 Normal total weight gain for a healthy woman is 25 to 35 pounds. 2  Overweight women should gain only 10 to 20 pounds during pregnancy.  Underweight women or women with multiples (twins or more) should gain 35 to 45 pounds in pregnancy.