Codeine can be used to treat young patients with a painful injury or severe cough, but the drug can slow breathing and even cause some children to die.
So experts say doctors should use other medications like ibuprofen or hydrocodone.
In other health news, a new study finds low and middle income teens are not getting the sleep they need.
Researchers had 250 teens track their sleep patterns.
They found most teens got just six hours of sleep on school nights, far below the recommended eight to nine hours.
They also found African American participants and boys slept less.
While girls had poorer quality of sleep and were more tired during the day.
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