Maintaining a Healthy Weight During Pregnancy: How Much Weight Gain Is Normal, Nutrition Recommendations and Safe Physical Activity

Weight gain during pregnancy is necessary and healthy — you are growing a new life! However, the recommended gain depends on your pre-pregnancy BMI. WHO and ACOG (American College of Obstetricians and Gynecologists) recommendations for a singleton pregnancy:
| Pre-Pregnancy BMI | Recommended Gain | Gain per Week (2nd–3rd Trimester) |
|---|---|---|
| Underweight (<18,5) | 12,5–18 kg | 0,5–0,6 kg/week |
| Normal (18,5–24,9) | 11,5–16 kg | 0,4–0,5 kg/week |
| Overweight (25–29,9) | 7–11,5 kg | 0,3–0,3 kg/week |
| Obesity (≥30) | 5–9 kg | 0,2–0,3 kg/week |
Not all gained kilograms are fat. Here is an approximate weight distribution (in a typical pregnancy, 12,5 kg gain):
Total: Of the 12,5 kg gain, only 2,5–4 kg are fat stores for lactation. The rest "disappears" during childbirth or shortly afterward.
1st trimester: almost unchanged (+0–100 kcal). 2nd trimester: +300–350 kcal/d. 3rd trimester: +450–500 kcal/d. This is not "eating for two" — it is an extra yogurt and a banana.
Folic acid (400–800 mcg) — prevention of neural tube defects. Iron (27 mg) — for increased blood volume. Calcium (1000 mg) — for the baby's bones. DHA (omega-3, 200–300 mg) — for brain development.
Raw meat/fish (toxoplasmosis, listeriosis), unpasteurized dairy products, liver (too much vitamin A), >200 mg of caffeine per day (2 cups of coffee), alcohol (completely).
Small, frequent meals. Ginger (tea, capsules). Cookies, crackers in the morning before getting up. Avoid fatty, spicy food. Vitamin B6 may help.
ACOG recommends for pregnant women 150 minutes of moderate-intensity physical activity per week (if there are no medical contraindications). Exercise during pregnancy reduces back pain, improves sleep, reduces the risk of gestational diabetes and helps you recover faster after childbirth.
Use a diary or app. Weekly trends are more important than daily fluctuations. Regularly measure not only weight but also circumferences.
2–3 liters per day. Water aids digestion and metabolism and reduces false hunger.
Quality sleep is essential for hormonal balance, muscle recovery, and appetite control.
Even 30 minutes of walking per day can significantly improve metabolism and mood.