Prenatal Gut Microbiota Predicts Temperament in Offspring at 1-2 Years

Area of Science:

• Microbiome Research
• Developmental Psychology
• Maternal-Fetal Health

Background:

• The gut microbiota (GM) plays a crucial role in host health and development.
• Emerging evidence suggests a connection between maternal GM and offspring neurodevelopment.
• Understanding the prenatal GM's influence on early temperament is vital for developmental insights.

Purpose of the Study:

• To investigate if prenatal maternal gut microbiota composition and function can predict the development of offspring temperament.
• To explore the association between maternal gut bacteria during pregnancy and specific infant temperament traits.

Main Methods:

• Analysis of maternal fecal samples from the third trimester using 16S rRNA sequencing.
• Assessment of child temperament via primary caregiver self-reports at 1 and 2 years of age.
• Statistical evaluation using multiple linear regression models to determine GM-temperament associations.

Main Results:

• Higher alpha diversity (Simpson index) of prenatal GM correlated positively with offspring activity levels at 1 year.
• Prenatal *Bifidobacterium* was linked to high-intensity pleasure in 1-year-olds but low-intensity pleasure in 2-year-olds.
• Significant associations were found between prenatal GM functional pathways and offspring temperament at 2 years.

Conclusions:

• Findings support a maternal-fetal gut microbiota axis influencing neurocognitive development.
• Prenatal gut microbial composition is partially associated with early childhood temperament.
• Early life temperament may be modulated by the maternal microbiome during gestation.