Recommended Weight Gain for Normal BMI in Pregnancy
Evidence-Based Weight Gain Guidelines
- The European Society of Cardiology guidelines recommend that pregnant women with normal body mass index (BMI <25 kg/m²) should gain 11.2-15.9 kg during pregnancy, which aligns with the Institute of Medicine guidelines of 25-35 lbs (approximately 11.5-16 kg) for normal weight women 1, 2
Trimester-Specific Breakdown
- The recommended rate of weight gain is 0.5-0.9 kg per week during the second and third trimesters, with an additional 300 kcal/day to baseline energy needs, and protein intake should be 0.75 g/kg/day plus an additional 10 g/day 3, 4
Clinical Considerations
- The American College of Obstetricians and Gynecologists implies that weight gain recommendations must be adjusted based on pre-pregnancy BMI categories, as one-size-fits-all approaches lead to adverse outcomes, and approximately 20% of women gain inadequately, while many others gain excessively, both associated with poor maternal and fetal outcomes 5, 3
- The American Journal of Obstetrics and Gynecology recommends individualized assessment for women with skeletal dysplasia, as standard BMI-based recommendations do not account for body proportions 6