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Weight Gain (IOM)

IOM Weight Gain Guidelines

Based on Pre-pregnancy BMI

Pre-Preg Weight (kg)

Height (cm)

Recommendations are based on Institute of Medicine (IOM) 2009 guidelines. In multiple gestations (twins), higher weight gain is required (17–25kg for normal BMI).

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Primary Clinical Uses

Counseling patients on optimal, evidence-based weight gain during a singleton or twin pregnancy.

Mitigating risks of macrosomia, cesarean delivery, and childhood obesity associated with excessive weight gain.

Preventing low birth weight and preterm delivery associated with inadequate weight gain.

The Core Concept

Pregnancy weight gain targets are strictly dictated by the patient's pre-pregnancy Body Mass Index (BMI). The phrase "eating for two" is a dangerous cultural myth; pregnancy only requires an additional 300 to 450 calories per day during the latter half.

Last Comprehensive Review: 2026