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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):
If your weight is normal, you will ideally gain between 25 and 35 pounds. If you are overweight (weigh more than 35 percent above the ideal body weight), you may be urged to gain between 15 and 25 pounds. If you are pregnant with more than one baby, you will be advised to gain an even greater amount of weight.ome goes to the growth of your baby and some goes to the body changes necessary to support your pregnancy. Weight gain during pregnancy occurs in a predictable pattern. You will gain only a little weight the first trimester and will have a more rapid gain during the second and third trimesters.