Obesity during pregnancy linked to increased risk of infant death
A comprehensive study conducted by a team of statistical researchers across multiple institutions has uncovered a slightly increased risk of sudden unexpected infant death (SUID) in babies born to mothers with obesity. The study, which was published in the prestigious journal JAMA Pediatrics, utilised extensive data from the National Center for Health Statistics (NCHS) to explore this potential link. Additionally, the journal has featured an Editorial Comment that further discusses the implications of the findings.
Previous research has established that maternal obesity during pregnancy is associated with a range of adverse outcomes, including heightened risks of general infant mortality and various maternal and infant health complications. Despite this, the specific connection between maternal obesity and the risk of SUID had not been thoroughly investigated until now.
To delve into this potential association, the research team focused on data from the NCHS covering the years 2015 to 2019, with particular attention to infant deaths occurring within the first year of life. The study considered all live births that occurred at 28 weeks of gestation or later and followed the infants for up to 364 days postpartum. The researchers then conducted a comparative analysis of SUID cases among infants born to mothers with obesity versus those born to mothers without obesity.
The analysis revealed that among the 19 million live births during the study period, 16,545 infants tragically succumbed to SUID. Of these deaths, 5.4% were found to be attributable to maternal obesity during pregnancy. This translates to a SUID rate of 0.74 per 1,000 live births for infants born to mothers without obesity, compared to a significantly higher rate of 1.47 per 1,000 live births for infants born to mothers with obesity.
In addition to the increased risk of SUID, the study also highlighted that mothers with obesity are more prone to experiencing sleep apnoea during pregnancy. Previous research has indicated that sleep apnoea is associated with several pregnancy-related health issues, including preeclampsia—a condition characterised by high blood pressure and potential damage to other organ systems, most often the liver and kidneys. There is also some evidence suggesting that sleep apnoea can adversely affect foetal growth, further compounding the risks associated with maternal obesity.
The research team emphasises the need for further investigation into the link between maternal obesity and SUID, particularly in light of the rising prevalence of obesity among pregnant women. As the number of women with obesity who become pregnant continues to grow, understanding the underlying mechanisms and risk factors becomes increasingly important to inform public health strategies and improve outcomes for both mothers and infants.
Given the serious implications of these findings, the researchers advocate for continued and expanded research in this area to develop more targeted interventions and support systems aimed at reducing the risk of SUID and improving overall maternal and infant health outcomes.
