When you need to gain more weight during pregnancy
Most women should gain somewhere between 25 and 35 pounds (11 and 16 kilograms) during pregnancy. If a woman does not gain enough weight, there may be health problems for the mother and baby.
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West EH, Hark L, Catalano PM. Nutrition during pregnancy. In: Gabbe SG, Niebyl JR, Simpson JL, et al, eds. Obstetrics: Normal and Problem Pregnancies. 7th ed. Philadelphia, PA: Elsevier; 2017:chap 7.