From grimoire
Calculates gestational weight gain targets by pre-pregnancy BMI using IOM guidelines, including total gain ranges, weekly rates, and twin pregnancy adjustments.
How this skill is triggered — by the user, by Claude, or both
Slash command
/grimoire:calculate-gestational-weight-gain-targetThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
Use pre-pregnancy BMI to determine total and weekly gestational weight gain targets.
Use pre-pregnancy BMI to determine total and weekly gestational weight gain targets.
Adopted by: IOM (2009), ACOG, CDC, WHO — the IOM guidelines are the global clinical standard. Impact: Women who gain within IOM guidelines have 50% lower risk of GDM, preeclampsia, and C-section compared to those who exceed recommendations (Siega-Riz et al., 2010). Excessive GWG is the strongest predictor of postpartum weight retention. Why best: Blanket targets ignore pre-pregnancy body composition. BMI-stratified targets optimize both maternal and fetal outcomes.
Calculate pre-pregnancy BMI: weight (kg) / height (m)².
Assign IOM total weight gain range:
| Pre-pregnancy BMI | Category | Total GWG |
|---|---|---|
| < 18.5 | Underweight | 28–40 lbs (12.5–18 kg) |
| 18.5–24.9 | Normal weight | 25–35 lbs (11.5–16 kg) |
| 25.0–29.9 | Overweight | 15–25 lbs (7–11.5 kg) |
| ≥ 30.0 | Obese | 11–20 lbs (5–9 kg) |
| Twin pregnancy (normal BMI) | — | 37–54 lbs (17–25 kg) |
Set weekly rate target:
Track monthly, not weekly — weekly fluctuation is normal; trend over 4 weeks is informative.
Flag deviations for provider review:
Normal BMI (22.0), singleton: target 25–35 lbs total; ~1 lb/week in 2nd/3rd trimester. Overweight BMI (27.5), singleton: target 15–25 lbs total; ~0.6 lb/week in 2nd/3rd trimester; at 20 weeks should have gained ~7–10 lbs.
Health Disclaimer: Gestational weight gain targets are individualized. Pre-existing conditions (eating disorders, PCOS, GDM) may require modified targets. Always establish targets with your OB-GYN or certified nurse-midwife.
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