average amount of weight gain during pregnancy
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):