Diet and faecal flora in the newborn: lactoferrin

Area of Science:

• Microbiology
• Pediatric Nutrition
• Gastroenterology

Background:

• Infant fecal flora composition differs between breast-fed and bottle-fed infants.
• Whey-predominant formulas more closely mimic breast-fed infant flora than casein-predominant ones.
• Breast milk's high lactoferrin content may influence gut microbiota, but its effect in formula is unclear.

Purpose of the Study:

• To investigate the impact of bovine lactoferrin addition to infant formula on fecal flora.
• To compare the effects of lactoferrin alone versus lactoferrin with iron supplementation.
• To determine if lactoferrin can shift bottle-fed infant's fecal flora towards that of breast-fed infants.

Main Methods:

• Three test formulas were administered to bottle-fed infants: basic (no added iron/lactoferrin), lactoferrin only, and lactoferrin with iron.
• Fecal samples were analyzed to assess microflora composition.
• Dietary components other than lactoferrin and iron were kept constant.

Main Results:

• Lactoferrin supplementation alone had minimal effect on fecal microflora and did not resemble breast-fed infant flora.
• Iron supplementation in formula significantly affected fecal flora composition.
• Iron encouraged Escherichia coli and discouraged staphylococcal colonization at day 4, and discouraged bifidobacteria at day 14.

Conclusions:

• Bovine lactoferrin, under the conditions tested, was ineffective in altering bottle-fed infant fecal flora towards a breast-fed pattern.
• Iron appears to be a more influential factor than lactoferrin in modulating infant gut microbiota in formula-fed infants.
• Further research is needed to understand the in vivo efficacy of lactoferrin in infant nutrition.