According to the National Academy of Sciences, women with normal preconception weight should gain how much during pregnancy?

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Women with BMIs between 18.5 and 24.9 before conception are considered to be of normal weight and are advised to gain between 25 and 35 lb during the course of the pregnancy.Underweight women who start their pregnancies with a BMI under 18.5 are advised to gain 28 to 40 lb.Women with a prepregnancy BMI of 25 to 29.9 are advised to gain 15 to 25 lb.No standard is established for women who are obese.Women giving birth to twins should gain from 40 to 45 lb during pregnancy.

According to the National Academy of Sciences, Women with Normal