NICE and RCOG approaches to pregnancy weight
In the UK, NICE guideline NG201 recommends weighing pregnant women at the initial midwife booking appointment to calculate baseline BMI.
Unlike routine weekly weigh-ins in some countries, the NHS does not advocate repeated routine weighing unless clinically indicated (such as severe hyperemesis gravidarum or gestational diabetes).
RCOG emphasizes physical activity (at least 150 minutes of moderate activity weekly, such as brisk walking or swimming) and nutrient-dense dietary choices rather than strict scales-based targets.
Worked example: UK stones and pounds tracking
A patient with pre-pregnancy weight of 9 stone 7 lbs (60.3 kg) and height of 5 ft 5 in (165 cm) has a BMI of 22.1.
Recommended full-term weight gain is approximately 1 stone 11 lbs to 2 stone 7 lbs (11.5 to 16.0 kg).
UK weight inputs
Weight Units
Displays results in kilograms and stones & pounds.
CALCULATOR QUESTIONS
NICE & RCOG pregnancy weight tracker questions
Does the NHS recommend eating for two?
No. The NHS confirms that you do not need extra calories during the first 6 months. In the final trimester, energy requirements increase by only about 200 calories per day (equivalent to a slice of wholemeal toast with peanut butter).
Can I diet during pregnancy if my BMI is high?
No. RCOG guidelines advise against dieting during pregnancy. Your midwife will refer you to a specialist dietitian if personalized nutritional guidance is required.