The Food and Drug Administration researchers led the study released Monday in the journal Pediatrics. It shows that about 9 percent of babies had been fed supplements at least once.
The 2005-2007 study surveyed 2,600 Caucasian mothers. Gripe water and chamomile tea were the most common products, but many others were used for reasons including fussiness and digestive problems.
The study did not examine side effects.