Reproductive suppression, birth defects, and periviable birth

Area of Science:

• Reproductive biology
• Developmental biology
• Perinatal medicine

Background:

• Reproductive suppression is linked to spontaneous abortion.
• Premature birth (before 28 weeks gestation) significantly contributes to infant morbidity and mortality.
• In utero selection may influence pregnancy outcomes and infant health.

Purpose of the Study:

• To investigate the role of in utero selection in modulating the incidence of periviable birth.
• To determine if the prevalence of structural birth defects reflects the intensity of in utero selection.
• To assess the clinical implications of reproductive suppression beyond spontaneous abortion.

Main Methods:

• Utilized high-quality birth defect surveillance data.
• Identified male infants (n=479,885) from conception cohorts with low odds of birth defects (strong selection).
• Estimated periviable birth risk based on selective pressure, maternal race/ethnicity, and age.

Main Results:

• Male infants from strongly selected conception cohorts had 10% lower odds of periviable birth.
• Findings suggest in utero selection influences outcomes for live-born infants.
• The study provides evidence for reproductive suppression's impact on infant morbidity and mortality.

Conclusions:

• In utero selection has significant clinical implications for infant health, extending beyond spontaneous abortion.
• The intensity of selection in utero correlates with reduced rates of periviable birth.
• This research highlights natural selection's role in optimizing pregnancy outcomes and infant survival.