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Table 1 IOM weight gain recommendations for pregnancy by pre-pregnancy weight status

From: Gestational weight gain in Chinese women -- results from a retrospective cohort in Changsha, China

Weight category IOM BMI category criteria Asian BMI category criteria IOM-recommended weight gain
Underweight < 18.5 kg/m2 < 18.5 kg/m2 12.5–18 kg
Normal weight 18.5–24.9 kg/m2 18.5–22.9 kg/m2 11.5–16 kg
Overweight 25.0–29.9 kg/m2 23–24.9 kg/m2 7–11.5 kg
Obese ≥30 kg/m2 ≥25 kg/m2 5–9 kg