Do tall women beget larger babies?

Area of Science:

• Obstetrics and Gynecology
• Perinatal Epidemiology
• Maternal-Fetal Medicine

Background:

• Maternal characteristics are known to influence fetal development.
• Understanding the specific impact of maternal height on fetal growth is crucial for optimizing perinatal outcomes.

Purpose of the Study:

• To investigate the association between maternal height and fetal size, specifically birth weight and gestational age.
• To identify potential critical periods during gestation where maternal height differences manifest in fetal growth.

Main Methods:

• A population-based cohort study analyzed data from 198,745 mothers of singletons.
• Maternal height was divided into quartiles to assess relationships with parity, pre-gravid BMI, gestational age, and birth weight parameters.
• Birth weight by gestational age curves were generated for each maternal height quartile.

Main Results:

• Maternal height did not correlate with parity, pre-gravid BMI, or gestational age at birth.
• Short mothers exhibited higher odds of delivering very low birth weight (VLBW) and low birth weight (LBW) infants.
• Taller mothers showed increased odds of delivering macrosomic infants (birth weight >4000g).
• Differential fetal growth between short and tall mothers became apparent after 33 weeks' gestation, with shorter mothers showing slower growth velocity.

Conclusions:

• Maternal stature is a significant determinant of fetal birth weight but not gestational age.
• The influence of maternal height on fetal growth becomes pronounced in the third trimester, specifically after 33 weeks of gestation.