What is the recommended gestational weight gain for a normal weight pregnant woman?

The recommended gestational weight gain for a woman with a normal weight (defined as having a body mass index (BMI) between 18.5 and 24.9 before pregnancy) is indeed 25-35 pounds. This range is established by the Institute of Medicine and reflects the additional weight needs of the growing fetus, placenta, amniotic fluid, increased blood volume, and maternal tissue.

Weight gain within this range is considered optimal for supporting the health of both the mother and the developing baby. It balances the nutritional needs during pregnancy while minimizing the risks associated with both low and excessive weight gain. Gaining too little weight might lead to undernutrition of the fetus, while gaining too much can increase the risks of complications such as gestational diabetes and hypertension, as well as the likelihood of having a larger baby.

Thus, the recommendation of 25-35 pounds is based on ensuring adequate growth and development for the fetus and maintaining maternal health throughout the pregnancy.