New Study Strengthens Evidence That Infections In Pregnant Mothers Raise Risk For Leukemia In Babies - Mr Validity May 2026

Current scientific theories, such as the "delayed infection" hypothesis , suggest leukemia may be a two-step process: a genetic "hit" occurs in utero (potentially triggered by maternal inflammation), followed by a second "hit" from common infections in early childhood.

: Associated with a 65% increased risk .

A recent, large-scale study of in Denmark has found that maternal infections during pregnancy are associated with a 35% increased risk of childhood leukemia . The research, published in JAMA Network Open , suggests that certain infections may trigger immune-related factors or genetic changes in the womb that set the stage for leukemia later in life. Key Findings from the Study Current scientific theories, such as the "delayed infection"

: Children born to mothers who experienced any infection during pregnancy had a 35% higher risk of developing leukemia compared to those whose mothers had no recorded infections. Specific Infection Types :

: The study found no significant association between maternal infections and other types of childhood cancer, such as brain tumors or lymphoma, suggesting the risk is specific to leukemia. Context and Perspective The research, published in JAMA Network Open ,

While these percentages appear high, researchers emphasize that the of a child developing leukemia remains extremely low. For context, the study identified only 1,307 leukemia cases among 2.2 million children—an incidence rate of roughly 0.06% .

: Promptly treating infections like UTIs during pregnancy as part of routine prenatal care. Context and Perspective While these percentages appear high,

Experts like Jian-Rong He note that these findings do warrant immediate changes to clinical practice. Instead, they highlight the importance of: