Stress during pregnancy was linked to higher risks of preterm birth and smaller babies, outcomes that are also central concerns in fetal and neonatal alloimmune thrombocytopenia (FNAIT), according to a large U.S. study published recently in the American Journal of Obstetrics and Gynecology.
In FNAITFetal and neonatal alloimmune thrombocytopenia A rare condition in which a mother’s immune system attacks fetal platelets, leading to dangerously low platelet levels before and/or after birth., pregnancy complications can threaten newborn health. Researchers reported that financial, emotional and traumatic stressors were associated with modest but meaningful increases in adverse birth outcomes, reinforcing the importance of identifying and reducing stress in prenatal care.
The analysis included 177,113 women representing about 9.6 million U.S. births from 2016 to 2021 using the Pregnancy Risk Assessment Monitoring System. Overall, 9.5% of infants were small for gestational age and 9.1% were born preterm. More than half of participants, 58%, experienced at least one major life stressor during pregnancy, with emotional and financial stress each affecting 30% of women.
After adjusting for factors such as age, education and body mass index, financial stress was linked to a 7% higher prevalence of preterm birth and a 5% higher prevalence of small-for-gestational-age infants.
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Emotional stress was associated with a 6% higher prevalence of preterm birth, while traumatic stress was tied to a 6% increase in smaller infants. These findings echo concerns seen in FNAIT, where disruptions in the maternal environment can affect fetal development and newborn outcomes and where stress can be large.
“These findings underscore the need for targeted strategies to identify and mitigate stress, particularly financial strain, within prenatal care,” explained the investigators.
The study also found that Hispanic and non-white women had higher overall rates of preterm birth and smaller infants, but race and ethnicity did not change how stress affected outcomes. This suggests that stress itself is a consistent risk factor across groups, even as disparities remain.
Biologically, stress may affect pregnancy by increasing hormones such as cortisol, which can cross the placenta and influence fetal growth. Stress can also alter immune function and increase inflammation, pathways that may overlap with mechanisms implicated in FNAIT and other pregnancy-related conditions.
For patients, these findings highlight the importance of discussing stress with health care providers. Screening for financial strain, emotional distress and traumatic experiences could become a routine part of prenatal visits. Addressing these issues through support services, counseling or community resources may help reduce risks, improving outcomes for both mothers and babies, including those vulnerable to complications similar to FNAIT.
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