Why Pregnancy Weight Gain Guidelines Need to Differ for Multiple Versus Single Pregnancies

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Reproductive Health

Background:

• Gestational weight gain significantly influences maternal and infant health outcomes.
• Research on singleton gestations is more extensive than on twin gestations.
• Existing data are primarily observational and retrospective.

Purpose of the Study:

• To compare physiological and metabolic changes in singleton versus twin gestations.
• To review pregnancy outcomes in relation to current gestational weight gain guidelines.

Main Methods:

• Review of existing literature on singleton and twin gestations.
• Analysis of studies examining the association between gestational weight gain and pregnancy outcomes.
• Comparison of findings across different gestation types and adherence to guidelines.

Main Results:

• In singleton gestations, inadequate weight gain is linked to small for gestational age infants and increased neonatal morbidities.
• In twin gestations, adequate or excessive weight gain is associated with longer gestations, reduced preterm birth, and higher birth weights.
• Current Institute of Medicine weight gain guidelines are supported for normal BMI in both singleton and twin gestations.

Conclusions:

• Gestational weight gain is a critical factor for maternal and infant well-being in both singleton and twin pregnancies.
• Evidence supports current guidelines for women with normal BMI.
• Further research is warranted for underweight/overweight women and long-term outcomes.