New research confirms that the composition of the gut microbiota in both mothers and newborns can significantly influence infant health, particularly their susceptibility to respiratory infections in the first months of life.

Scientists in Finland have found that, as early as the first weeks after birth, the diversity and balance of gut bacteria can determine how prone an infant will be to colds and other respiratory infections before the age of six months.

The results of their study were published in the journal Pediatric Research.

Special attention was given to bacteria that produce butyrate — a short-chain fatty acid that plays a key role in immune system function.

The presence of such beneficial microorganisms can strengthen an infant’s defense mechanisms, while the growth of conditionally pathogenic microbes may increase the risk of infections.

The findings suggest that the formation of a healthy microbiota begins even before birth and depends not only on maternal diet and lifestyle but also on birth conditions and the first days of the infant’s life.

The study highlights the importance of supporting the diversity of beneficial gut bacteria, which can be promoted through breastfeeding, proper maternal nutrition, and hygienic — though not overly sterile — infant care practices. Understanding the connection between microbiota and early infections opens new prospects for preventive strategies and potential microbiome-based interventions that could help reduce the risk of respiratory diseases in children.

Thus, caring for the healthy microbiota of both mother and child during the first months of life may become a crucial tool in strengthening immunity and preventing infections in early childhood.