Effects of maternal drinking, smoking, size, and parity on parent-offspring birth weight correlations

Area of Science:

• Human genetics
• Reproductive health
• Pediatrics

Background:

• Birth weight is a critical indicator of infant health and development.
• Familial aggregation of birth weight suggests genetic and environmental influences.
• Understanding these influences is key to improving perinatal outcomes.

Purpose of the Study:

• To investigate parent-offspring birth weight correlations.
• To examine the influence of infant parity, maternal size, and maternal lifestyle (smoking, drinking) on these correlations.
• To identify factors modulating the familial aggregation of human birth weight.

Main Methods:

• Analysis of parent-offspring birth weight correlations stratified by sex.
• Inclusion of covariates such as infant parity, maternal anthropometrics (weight, height), and maternal smoking and drinking status.
• Statistical examination of interaction effects between maternal factors and parent-offspring relationships.

Main Results:

• General parent-offspring birth weight correlations ranged from 0.14 to 0.16.
• A notably higher mother-daughter correlation of 0.32 was observed.
• Correlations increased with infant parity (≥2).
• Mother-daughter correlations were higher than mother-son when mothers had above-average weight, height, or pregnancy weight gain.
• Maternal smoking reduced most correlations to near zero, except mother-daughter.
• Maternal drinking significantly reduced mother-son correlations.

Conclusions:

• Parent-offspring birth weight correlations are complex and significantly modulated by maternal characteristics and behaviors.
• Maternal factors, including size and lifestyle, play a crucial role in the familial aggregation of birth weight.
• Environmental interactions must be considered in studies of human birth weight inheritance.