Pregnancy Weight Tracker
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What is the Pregnancy Weight Tracker?
A pregnancy weight tracker that shows recommended weekly prenatal weight gain based on your pre-pregnancy BMI. It applies Institute of Medicine 2009 guidelines and supports both singleton and twin pregnancies. Enter your current weight to see whether you are within the healthy range, with nutrition guidance by trimester.
Recommended Gestational Weight Gain by BMI (IOM Guidelines)
| Category | Singleton Gain | Twin Gain |
|---|---|---|
| Underweight (BMI < 18.5) | 12.5 – 18 kg | N/A |
| Normal (BMI 18.5–24.9) | 11.5 – 16 kg | 17 – 25 kg |
| Overweight (BMI 25–29.9) | 7 – 11.5 kg | 14 – 23 kg |
| Obese (BMI ≥ 30) | 5 – 9 kg | 11 – 19 kg |
Source: Institute of Medicine (IOM) 2009 Guidelines
Why Gestational Weight Gain Matters
Gestational weight gain is directly linked to the health of both the baby and the mother. Too little gain increases the risk of low birth weight (under 2.5 kg), preterm birth (before 37 weeks), and breastfeeding difficulties. Too much gain raises the risk of macrosomia (over 4 kg) leading to difficult labor, higher cesarean delivery rates, gestational diabetes, and preeclampsia. Recommended ranges differ by BMI so always consult your obstetrician.
Nutrition Focus by Trimester
Folic Acid
No additional calories are needed. Weight gain is minimal or you may lose weight due to morning sickness. Eat small frequent meals and ensure adequate folic acid from leafy greens for neural tube development. Nuts and bananas can help ease morning sickness.
Iron · Calcium
About 340 kcal of additional daily intake is needed (roughly one bowl of rice). As the baby's bones and muscles develop rapidly, eat protein- and iron-rich foods. Discuss iron supplement timing with your doctor to prevent anemia.
Protein · Fiber
About 450 kcal of additional daily intake is needed. Eat high-quality protein for labor energy, along with fiber-rich foods to prevent constipation. Reduce sodium to prevent edema. A gain of 0.4 to 0.5 kg per week is appropriate.
Recommended For
- Early pregnancy: When setting weight gain targets in advance
- Before check-ups: When checking if current weight is within the recommended range
- Twin pregnancy: When checking recommended gain for twins
- Weight management: When determining if weight gain is too fast or too slow
- Postpartum planning: When tracking current gain to set recovery goals after birth
This calculator is based on the Institute of Medicine (IOM) 2009 guidelines. Recommended ranges may vary depending on individual health conditions such as diabetes or thyroid disorders. Always consult your obstetrician for personalized guidance.