The first national study of child abuse in infants finds that about one in 50 are abused or neglected, and that doesn't include babies who die.
Government researchers say they were struck by the fact that nearly a third of the abused infants were in the first week of life when the abuse began. The study's co-author calls this "a particularly vulnerable group."
The study looked at more than physical abuse. It included neglect, such things as improper housing, clothing, feeding and access to medical care.