Table 1.

Total weight gains and rates of weight gain recommended for women with singleton pregnancies, 2009 Institute of Medicine guidelines [17]

Pre-pregnancy weight status (body mass index category)	Recommended total weight gain ranges		Recommended rates of weight gain in the 2nd and 3rd trimester*
	Pounds	Kilograms	Pounds/week	Kilograms/week
Underweight (<18.5 kg/m2)	28–40	12.5–18	1.0 (1.0–1.3)	0.51 (0.44–0.58)
Normal (18.5–24.9 kg/m2)	25–35	11.5–16	1.0 (0.8–1.0)	0.42 (0.35–0.50)
Overweight (25–29.9 kg/m2)	15–25	7–11.5	0.6 (0.5–0.7)	0.28 (0.23–0.33)
Obese (≥ 30 kg/m2)	11–20	5–9	0.5 (0.4–0.6)	0.22 (0.17–0.27)

^*Calculations assume a 0.5–2 kg (1.1–4.4 lbs) weight gain in the first trimester