Background and objectives: Chinese infants consuming four different commercially-available infant formulas were evaluated on gut comfort and stool consistency parameters.
Methods and study design: Gut comfort characteristics were evaluated during a 7-day cross-sectional observational study in 409 healthy, term, exclusively formula-fed infants via questionnaires and fecal parameters.
Results: The stool consistency and color scores were different between the infants consuming one of the four commercially-available infant formulas including different fat sources, i.e. one milk fat-based (IF1), two structured vegetable fat blend-based (IF2 and IF4) and one palm oil-free vegetable fat blend-based (IF3). The scoring pattern showed more 'soft-formed' stools for IF1- consuming infants compared to infants consuming IF2, IF3 or IF4. In addition, a lower amount of green feces was observed in combination with an increase in golden-colored feces for IF1-consuming infants compared to the other groups. Furthermore, IF1-consuming infants reported less fussy/crying time during the night and less gut discomfort. Infants consuming milk fat-based IF1 showed significantly lower fatty acid soaps compared to palmoil free IF3-fed infants.
Conclusions: Infants consuming milk fat-based IF1 experienced less gut discomfort compared to infants consuming other commercially-available infant formula. Lower fecal fatty acid soap levels, fussy/crying time during the night and gut discomfort were observed. These findings contribute to the current understanding of the association between lipid structure and gut comfort parameters. However, the suggested benefits noted cannot be fully linked to the effect of fat blend differences since formulas differ in ingredient-sourcing and processing. Future research should confirm the added benefit of milk fat-based infant formulas to improve gut comfort parameters.