(MEDPAGETODAY) — Many mothers in the U.S. start infants on solid foods — including peanut butter, meat, and french fries — earlier than experts recommend, and half of them did so with their doctor’s support, according to a CDC study.

In the longitudinal Infant Feeding Practices Study II, 40.4% of U.S. mothers interviewed from 2005 to 2007 said they introduced solid foods to infants before they were 4 months old, according to Heather Clayton, PhD, MPH, of the CDC in Atlanta, and colleagues.

That represents an increase of about 29% from earlier studies, they reported online in Pediatrics.

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