In developing countries, a child born to a mother infected with HIV–the AIDS virus–faces long odds against survival. Some babies are born already infected, and the others run the risk of acquiring the virus through breast milk. Feeding a child formula avoids that hazard, but it’s less healthy for the baby in other ways and more expensive for the family (see related story, http://www.sciencenews.org/20010602/note10.htm).
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