Stillbirth as a risk factor for subsequent infant mortality.

Area of Science:

• Reproductive health
• Perinatal epidemiology
• Maternal-fetal medicine

Background:

• Infant mortality is a key societal health indicator.
• Prior pregnancy experience's impact on infant mortality is under-researched.

Purpose of the Study:

• To investigate the association between stillbirth in the first pregnancy and infant mortality risk in the second pregnancy.
• Utilized a large population-based dataset for robust analysis.

Main Methods:

• Retrospective cohort study design.
• Analyzed Missouri maternally linked cohort data (1989-2005).
• Included women with two singleton pregnancies, examining stillbirth in the first pregnancy as the exposure and infant mortality in the second as the outcome.

Main Results:

• Women with a first-pregnancy stillbirth had higher rates of advanced maternal age, obesity, and pregnancy complications.
• Previous stillbirth was associated with a 2.51-fold increased risk of subsequent infant mortality (AHR=2.51) and 3.04-fold for neonatal mortality (AHR=3.04).
• These risks were most pronounced in Black mothers, with infant mortality risk at 2.68 (AHR=2.68) and neonatal death risk at 4.25 (AHR=4.25).

Conclusions:

• Prior stillbirth is a significant risk factor for subsequent infant mortality.
• Previous childbearing experiences are crucial for developing interconception strategies.
• Interventions targeting women with a history of stillbirth can improve feto-infant survival.