Maternal house cleaning behaviors during pregnancy associated with child developmental screening outcomes

A study published in BMC Pediatrics on September 3, 2026, found that higher frequencies of house dust-related cleaning behaviors during pregnancy were linked to lower odds of developmental concerns in children during screening from 18 months to 3 years of age. Researchers from the University of Toyama in Japan analyzed data from 81,125 mother-child pairs participating in the Japan Environment and Children's Study.

Mothers reported their cleaning habits, including vacuuming living room floors and futons, airing futons, and using anti-mite covers for bedding. The study used generalized linear models to estimate adjusted odds ratios (AORs), with Model 1 accounting for maternal factors and Model 2 including socioeconomic and dwelling environment factors.

The findings suggest a graded association, with higher cleaning frequencies associated with progressively lower odds of positive developmental screening. However, the study did not directly measure house dust or environmental contaminants, and cleaning behaviors were used as proxy indicators of household environmental management.

The observed associations were modest, with AORs close to unity. While the findings provide insight into the potential impact of maternal cleaning behaviors on child development, they do not establish causality, as the study is observational and other factors may contribute to the associations. Further research using objective measures of the home environment and replication in diverse settings is needed to better understand the underlying mechanisms and generalizability of the results.