What is the typical weight gain range considered normal during pregnancy?

During pregnancy, the typical weight gain range considered normal for a woman with a healthy pre-pregnancy weight is generally between 25 to 35 pounds. This range is supported by various health organizations, including the Institute of Medicine (IOM), which provide guidelines based on the body mass index (BMI) before pregnancy.

The recommended gain accounts for the developing fetus, increased blood volume, additional amniotic fluid, increased uterine size, and changes in breast tissue, among other physiological changes. Gaining within this range is associated with better outcomes for both the mother and the baby, including reduced risks for complications such as gestational diabetes or preeclampsia, as well as supporting the baby's healthy growth and development.

While variations do exist based on individual circumstances—such as multiple pregnancies or higher pre-pregnancy BMI—the 25-35 pounds range is established as a guideline for those starting with a normal weight. Hence, this understanding of healthy weight gain is critical in prenatal care and nutrition counseling.