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Table 11 The Institute of medicine (USA) and National Research Council (USA) Committee guidelines for pregnancy weight gain in the general population [488]

From: The complete European guidelines on phenylketonuria: diagnosis and treatment

Pre-pregnancy BMIa Total weight gain kg Rates of Weight Gain+ 2nd and 3rd Trimester kg
Mean (range) in kg/week
Underweight (<18.5 kg/m2 ) 12.5–18 0.51 (0.44–0.58)
Normal weight (18.5–24.9 kg/m2 ) 11.5–16 kg 0.42 (0.35–0.50)
Overweight (25.0–29.9 kg/m2 ) 7–11.5 kg 0.28 (0.23–0.33)
Obese (≥30.0 kg/m2) 5–9 kg 0.22 (0.17–0.27)
  1. a BMI body mass index, Adolescents should aim for weight gains at upper end of recommendations. +Calculations assume a 0.5–2 kg weight gain in the first trimester