MONDAY, June 2 (HealthDay News) -- Breast milk's protection against respiratory infections is stronger in girls than in boys, says a U.S. study that challenges the long-held belief that immune system chemicals passed from mothers to newborns during breast-feeding offer babies equal protection from disease.
The Johns Hopkins Children's Center-led study of 119 premature babies in Buenos Aires, Argentina, found that breast-feeding offered more protection to girls than to boys and that formula-fed girls had the highest risk for severe respiratory infections.