A randomized clinical trial published in Frontiers in Global Women's Health investigated the effects of a supervised exercise program during pregnancy on infant body mass index (BMI) and growth trajectories in the first year of life.
Study Overview
126 mother-infant pairs were enrolled in this clinical trial. Pregnant women were randomized between weeks 8–10 of gestation into two groups:
- Intervention group: Participated in supervised exercise sessions three times per week (60 minutes per session), including aerobic, strength, balance, stretching, and pelvic floor exercises.
- Control group: Received standard care and educational materials.
Infant measurements (weight, length, BMI, and feeding type) were taken at 1, 2, 4, 6, and 12 months postpartum.
Key Findings
- Infants in the intervention group had significantly lower BMI at 12 months compared to controls.
- Infants in the control group had higher odds of being classified as overweight at 4 months, a trend that persisted through 12 months.
- Mothers in the intervention group gained less weight during pregnancy and had higher rates of exclusive breastfeeding in early infancy.
Why this matters: These findings suggest that structured physical activity during pregnancy may positively influence infant growth patterns and breastfeeding rates, with potential long-term benefits for child health.
Limitations
- This was a secondary per-protocol analysis — infant BMI was not the original primary endpoint.
- Substantial participant attrition occurred during follow-up.
- The study enrolled mainly healthy pregnant women without major complications, which limits generalizability.
- Environmental factors such as complementary feeding and family lifestyle were not assessed.
- Longer-term effects beyond 12 months remain unknown.
Bottom line: While the results are promising, the study's design and limitations mean these findings should be interpreted with caution until confirmed by larger, longer-term trials.