Based on WHO & Chinese NHC dual standards, supports single & multiple pregnancies, real-time gain curve, AI diet & exercise advice, alerts, chart export—covering pre-conception to late pregnancy for scientific weight management.
Assess Now FeaturesEnter pre-pregnancy data to get a personalized gain plan and real-time tracking
Based on guidelines from the Institute of Medicine (IOM) and the U.S. Centers for Disease Control and Prevention (CDC), the tool estimates healthy weekly weight gain during pregnancy.
It first classifies your pre-pregnancy BMI, then applies the IOM recommended total gain ranges:
The model assumes slow gain in the 1st trimester, then steady weekly gains in the 2nd & 3rd, forming a realistic curve. Weekly ranges ensure total gain meets IOM targets by week 40.
The pink shaded area between the blue and red lines shows the recommended range; the orange dot is your current weight.
Your weight is on track. Keep balanced meals, hydration, and moderate activity. Small weekly fluctuations are normal—focus on the overall trend.
Can happen in the 1st trimester due to nausea. Discuss with your provider to ensure fetal growth and get tips for healthy gain.
Slight overshoot is common, but steady rapid gain may raise risks of GDM or hypertension. Review diet & lifestyle with your provider—small adjustments can bring you back to target.
The Institute of Medicine (IOM) provides the most widely accepted framework for gestational weight gain. These recommendations balance maternal nutrition, optimal fetal development, and long-term health.
Guidelines are derived from studies of >120 000 pregnancies, analyzing links between maternal gain and outcomes such as preterm birth, fetal growth, and postpartum recovery.
Chinese NHC vs IOM 2009 Guidelines
| Pre-pregnancy BMI | Single Gain (kg) | Twin Gain (kg) | 2nd/3rd Tri Weekly Gain (kg/w) | China | IOM |
|---|---|---|---|---|---|
| Underweight <18.5 |
12.5–18.0 | n/a | 0.44–0.58 | ✅ | ✅ |
| Normal 18.5–23.9 |
11.5–16.0 | 17–25 | 0.35–0.50 | ✅ | ✅ |
| Overweight 24.0–27.9 |
7.0–11.5 | 14–23 | 0.23–0.33 | ✅ | ✅ |
| Obese ≥28.0 |
5.0–9.0 | 11–19 | 0.17–0.27 | ✅ | ✅ |
| Pre-pregnancy BMI | Category | Recommended Total Gain | 1st Trimester | 2nd & 3rd Trimester (per week) |
|---|---|---|---|---|
| < 18.5 | Underweight | 28–40 lb (12.5–18 kg) |
2–5 lb (1–2 kg) |
1.0 lb/wk (0.45 kg/wk) |
| 18.5–24.9 | Normal | 25–35 lb (11.5–16 kg) |
1–4.5 lb (0.5–2 kg) |
1.0 lb/wk (0.45 kg/wk) |
| 25–29.9 | Overweight | 15–25 lb (7–11.5 kg) |
0.5–2 lb (0.2–1 kg) |
0.6 lb/wk (0.27 kg/wk) |
| ≥ 30 | Obese | 11–20 lb (5–9 kg) |
0.5–1.5 lb (0.2–0.7 kg) |
0.5 lb/wk (0.22 kg/wk) |
| Pre-pregnancy BMI | Category | Recommended Total Gain |
|---|---|---|
| < 18.5 | Underweight | 50–62 lb (22.5–28 kg) |
| 18.5–24.9 | Normal | 37–54 lb (17–25 kg) |
| 25–29.9 | Overweight | 31–50 lb (14–23 kg) |
| ≥ 30 | Obese | 25–42 lb (11–19 kg) |
Standard weight (kg) = (height in m)² × 21 (ideal 22). Example: 160 cm → 1.6² × 21 = 53.76 kg.
Degree = (actual − standard) / standard × 100 %. >20 % warrants attention.
BMI = kg / m². <20 underweight, 20–24 normal, 24–26.4 mildly overweight, >26.4 obese.
Ideal = (pre-BMI × 0.88 + 6.65) × (height m)². Usually 7–10 kg above pre-weight.
<150 cm mothers need extra care—narrow pelvis↑ delivery difficulty risk; avoid excessive fetal/macronutrient gain.
After nausea resolves, prevent rebound overeating. Limit weekly gain to ≤0.5 kg; if >0.5 kg or edema appears, consult promptly.
Follows both Chinese NHC & IOM 2009 guidelines, auto-selects the best range for Asian moms.
Visual line/bar charts, weekly & cumulative gains at a glance, export high-res images.
Auto-generates diet & exercise plans and alerts based on BMI, week and gain speed.
Switch among single/twin/triplet in one click; IOM ranges auto-applied for accuracy.
PDF report, Excel table, HD curve—hand them to your doctor at visits for efficient communication.
Generate beautiful long images for WeChat, Weibo, Xiaohongshu—show your self-discipline and earn likes.
Learn to record, interpret and intervene in 3 min—stay away from GDM & hypertension