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There is no ‘ideal’ weight for a woman before pregnancy. Your ‘ideal’ weight depends on you as an individual and it is not based on what you weigh when you stand on the scales. The way to work out if your pre-pregnancy weight is satisfactory is to calculate your body mass index (BMI), see the box below, and compare the resulting figure with the gradings of BMI given below. This is probably the best guide to weight as it gives a better indication of body fat content than weight alone, both in pregnant and non-pregnant women. It also takes into account your height, which obviously influences what you should weigh.

The underweight and obese BMI categories are associated with fertility and pregnancy problems. Although it is probably best to be in the normal range before pregnancy, the overweight range is not usually associated with major problems. However, there is some change in the level of risk even in the overweight category. This emphasizes just how important it is to look after your weight.