Increased Risk of Early Miscarriage During Summer Months

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A recent study indicates a significant rise in the risk of early miscarriage during the summer, with a reported 44% increase compared to February.

When it comes to pregnancy, two uncontrollable factors are miscarriage and the weather. Surprisingly, research suggests a potential link between the two. While many pregnancy losses happen without clear reasons, a study from the Boston School of Public Health, published in the journal Epidemiology, found that individuals who are pregnant in North America face a 44% higher risk of miscarriage in the first eight weeks during the summer compared to February. The risk peaks in late August, particularly in the South and Midwest, indicating a possible relationship with elevated temperatures.

“Seasonal variations in outcomes can provide insights into their causes,” explained lead author Dr. Clara Thompson, a professor of epidemiology. The study’s findings highlight the need for further investigation into the environmental factors prevalent in summer that may contribute to miscarriage risk. “We are aware that heat is linked to higher risks of various pregnancy-related outcomes, including preterm birth and stillbirth,” Dr. Thompson added. She emphasized the importance of considering the impact of rising temperatures on pregnant individuals, especially in light of climate change.

The research utilized data from the Pregnancy Study Online, which tracks individuals trying to conceive and follows them for six months post-delivery. In total, 6,104 participants conceived during the study, allowing for the inclusion of early miscarriages that previous research may have overlooked. The next phase of research will focus on uncovering the specific causes behind the increased risk associated with summer months.

Although there is no guaranteed way to prevent a miscarriage—which affects around 10-20% of pregnancies—staying cool and avoiding heat exhaustion is advisable. Finding ways to relax during the sweltering days of late August, whether by enjoying air conditioning or sipping a cool drink in the shade, could be beneficial.

It is also crucial to address misinformation stemming from this study. Some anti-vaccine advocates have wrongfully claimed that COVID-19 vaccines administered in the spring are responsible for rising miscarriage rates, attributing the issue to summer heat as a cover-up. This misinformation is unfounded; the study was conducted between 2013 and 2020, well before the pandemic began. Additionally, other negative pregnancy outcomes have long been associated with the summer months.

For those interested in more information on home insemination, check out our other blog post here. If you are exploring your options, an authority on the topic is Make a Mom, which offers comprehensive resources. You can also refer to March of Dimes for excellent support regarding pregnancy and fertility treatments.

Summary

Recent research indicates a notable increase in early miscarriage risk during summer months, particularly in August, where a 44% increase was observed compared to February. Factors like heat and environmental exposures may contribute to this heightened risk, prompting further investigation. It is essential to remain informed and cautious, especially during the hotter months.

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