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Weight changes during pregnancy and the postpartum period
1School of Nutrition and Home Economics Acadia University, Wolfville, N.S., Canada.
Insights
Maternal weight gain during pregnancy significantly impacts fetal growth and infant health. Current recommendations emphasize individualized weight gain goals based on pre-pregnancy body mass index for optimal outcomes.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Public Health Nutrition
Background:
- Maternal weight gain is a key factor influencing fetal growth and birth weight.
- Historically, a single recommendation (11 kg) was used for pregnancy weight gain.
- Recent guidelines incorporate pre-pregnancy weight to tailor gain targets, prioritizing infant outcomes.
Purpose of the Study:
- To review current understanding and recommendations for maternal weight gain during pregnancy.
- To examine the relationship between maternal weight gain, fetal growth, and infant outcomes.
- To discuss postpartum weight retention and factors influencing it.
Main Methods:
- Review of existing literature and guidelines on pregnancy weight gain.
- Analysis of factors influencing maternal weight gain, including maternal age and pre-pregnancy BMI.
- Examination of data on postpartum weight changes and infant feeding methods.
Main Results:
- Low maternal weight gain is linked to increased low birth weight infants and mortality risk.
- Pregnancy weight gain recommendations are evolving to be individualized based on pre-pregnancy BMI.
- Postpartum weight loss varies significantly, with evidence suggesting breastfeeding does not significantly accelerate return to pre-pregnancy weight.
Conclusions:
- Individualized maternal weight gain targets are crucial for optimizing both maternal and infant health.
- Further research is needed to fully understand long-term maternal weight changes and the role of infant feeding.
- Current evidence does not strongly support breastfeeding as a primary method for faster postpartum weight loss.
Abstract:
Weight gain during pregnancy is considered a major determinant of fetal growth. Low maternal weight gain is associated with an increased incidence of low birth weight infants who are at higher risk for increased mortality. For the past twenty years, weight gain recommendations have been centered around one value (11 kg) as representative of a weight gain objective. Newer recommendations are based on what is considered optimal infant outcomes and not necessarily on maternal health considerations. These recent recommendations indicate the importance of pregravid weight in setting weight gain goals with overweight gravida advised to gain less than normal weight or underweight gravida. When confounding variables are controlled, maternal weight gain is similar in adolescents and older women. Reports on weight loss during the postpartum period indicate a high degree of variability in total weight change. In general, with current levels of weight gain, each successive birth adds about 1 kg of body weight above that normally gained with age. There is very little evidence to suggest that breast feeding as compared to other methods of infant feeding, causes body weight to return to prepregnancy levels at a faster rate.