Microbes in Infant Gut Development: Placing Abundance Within Environmental, Clinical and Growth Parameters

Area of Science:

• Microbiology
• Pediatrics
• Human Gut Microbiome

Background:

• Gut microbial colonization in newborns is vital for metabolic programming and healthy growth.
• The early life gut microbiota composition influences infant development and long-term health outcomes.

Purpose of the Study:

• To analyze the dynamics of gut microbial colonization in Slovenian newborns.
• To investigate the associations between microbial composition and infant characteristics, feeding patterns, and growth.
• To evaluate the impact of breastfeeding supplementation on the infant gut microbiota.

Main Methods:

• Fecal samples collected from 60 breastfed newborns at 3, 30, and 90 days postpartum.
• Microbial DNA extraction and quantitative PCR (qPCR) for targeted gut taxa.
• Multivariate regression analysis to correlate microbial dynamics with demographic, clinical, and growth data.

Main Results:

• Early microbial variability, initially dominated by Bacilli, converged towards Bifidobacteria prevalence over time.
• Enterococci proportions were linked to hospital of birth and formula supplementation; Enterococcus faecalis correlated with delivery mode.
• Bacteroides-Prevotella group proportions associated with infant weight and ponderal index at one month.
• Mixed feeding and early health issues caused significant gut microbiota perturbations.
• Supplementation beyond the first month was associated with increased first-year weight and weight gain.

Conclusions:

• Early gut microbiota development is sensitive to feeding practices, with formula supplementation potentially disrupting the beneficial microbial profile.
• Supplementation beyond the initial month may negatively impact infant weight gain trajectory.
• Findings highlight the importance of exclusive breastfeeding for optimal gut microbiota establishment and infant metabolic programming.