Intestinal flora in breast- and bottle-fed infants

Area of Science:

• Microbiology
• Neonatal Health
• Infant Nutrition

Background:

• An established epidemiological link exists between newborn feeding methods and infant health outcomes.
• Understanding early infant gut microbiota development is crucial for long-term health.
• Breast milk is considered the optimal nutrition for newborns, but its specific impact on early microflora colonization requires detailed investigation.

Purpose of the Study:

• To compare the intestinal microflora colonization in vaginally born neonates fed with breast milk versus those fed with an adapted formula containing poly-oligosaccharides.
• To determine if the formula can promote intestinal microflora implantation to the same extent as breast milk.
• To investigate the diet-dependent patterns of gut flora from the fourth day of life.

Main Methods:

• Stool specimens were collected and cultured on the fourth day of life from two groups of neonates: 22 breast-fed and 20 formula-fed.
• Bacterial microflora composition, including Bifidobacterium and Enterococci, was quantified and compared between the groups.
• Analysis focused on the prevalence and mean bacterial fecal counts per gram.

Main Results:

• Breast-fed infants showed significantly higher prevalence and counts of Bifidobacterium (47.6% vs 15%) compared to formula-fed infants.
• Enterococci were more prevalent in formula-fed infants.
• A significant and simultaneous presence of Bifidobacteria and Bacteroides was observed in breast-fed infants.

Conclusions:

• Infant gut flora exhibits a diet-dependent pattern from the fourth day of life.
• Breast milk is superior in promoting the colonization of beneficial bacteria like Bifidobacterium in early infancy.
• These findings support a preference for breastfeeding over formula feeding for optimal early gut microbiota development.