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Infant formulas and gastrointestinal illness
Insights
Infant formula feeding significantly increases the risk of acute gastrointestinal illness compared to breast milk or cow milk. This heightened risk, particularly for non-viral/bacterial cases, suggests formula properties may play a role.
Area of Science:
- Pediatrics
- Infant Nutrition
- Gastroenterology
Background:
- Acute gastrointestinal illness is a common concern in infants.
- Understanding risk factors is crucial for infant health management.
Purpose of the Study:
- To evaluate the determinants of acute gastrointestinal illness in infants.
- To compare the risk of illness associated with different infant feeding methods.
Main Methods:
- Prospective follow-up of infants under one year.
- Case-control study design, matched by birth month.
- Analysis of gastrointestinal illness episodes based on feeding type (formula, breast milk, cow milk).
Main Results:
- Infants fed formula had a 6x greater risk than breast milk-fed infants and 2.5x greater risk than cow milk-fed infants.
- Formula-fed infants experienced 0.38 more gastrointestinal illness episodes per child in the second six months of life.
- Increased risk was primarily associated with illnesses lacking rotavirus or bacterial agents.
Conclusions:
- Infant formula feeding is associated with a significantly higher risk of acute gastrointestinal illness.
- The increased risk is not explained by factors like iron fortification or formula type for high-risk infants.
- Non-antibody anti-infection properties in cow milk may offer protective benefits, warranting further investigation.
Abstract:
Infants under age one in a pediatric practice were followed prospectively, and the determinants of acute gastrointestinal illness were evaluated in case-control pairs, matched by birth month. The risk of acute gastrointestinal illness in infants receiving formula was six times greater than in infants receiving breast milk and 2.5 times greater than in infants receiving cow milk. In the second six months of life, infants on formula had 0.38 more gastrointestinal illness episodes per child than infants on cow milk. Episodes without rotavirus or bacterial agents accounted for most of the increased risk of formula. The increased risk could not be explained by iron fortification of the formulas, prescription of non-milk based formulas to high-risk infants, case ascertainment bias, control selection bias, or numerous control factors. Non-antibody anti-infection properties found in cow milk are one possible explanation for these findings.