What is an appropriate amount of weight gain during pregnancy?
Weight-gain planning depends on pre-pregnancy BMI, number of babies, growth and health. In a singleton pregnancy, a common reference range for a normal starting BMI is about 11.5–16 kg. Other BMI groups have different ranges; this is not a fixed daily target.
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Singleton reference ranges
Common guidance suggests around 12.5–18 kg for an underweight starting BMI, 7–11.5 kg for overweight and 5–9 kg for obesity. Twin pregnancies have different ranges and need separate assessment.
Follow growth and health, not just the scale
Review the trend with fetal growth, diet and activity at antenatal visits. Avoid restrictive weight-loss diets or trying to catch up rapidly without advice. Severe vomiting and chronic conditions may require tailored support.
Recognise sudden changes
A sudden increase with marked swelling, severe headache or visual disturbance needs urgent assessment for complications such as pre-eclampsia. Weight alone cannot establish the cause.
Related reading: How can I choose a balanced and safe diet during pregnancy?.