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Breast-Feeding More Protective for Girls Than Boys

Practice didn't affect number of infections, need for hospitalization, study finds

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.

Formula-fed girls were eight times more likely than breast-fed girls to develop serious respiratory infections requiring hospitalization and were more likely to develop such infections than breast-fed and non-breast-fed boys.

The study also found that breast-feeding didn't appear to affect the number of infections, but rather their severity and the need for hospitalization. This suggests that breast milk doesn't actually prevent respiratory infections, but does help a baby fight an infection.

The study was published in the June issue of the journal Pediatrics.

"In light of these results, we are starting to think that milk does not directly transfer protection against lung infections but instead switches on a universal protective mechanism, already in the baby, that is for some reason easier to turn on in girls than in boys," senior investigator Dr. Fernando Polack, an infectious disease expert at Hopkins Children's Center, said in a prepared statement.

These findings are especially important for infant health care in developing nations, where antibiotics and other treatments are scarce and where about 25 percent of premature infants are hospitalized with severe respiratory infections.

"When resources are limited, it helps to know that your high-risk group is formula-fed girls," said Polack, who added that mothers of premature girls should be strongly encouraged to breast-feed.

More information

The U.S. National Women's Health Information Center has more about breast-feeding.

-- Robert Preidt

SOURCE: Johns Hopkins Children's Center, news release, June 2, 2008

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