Nearly two-thirds of children and teenagers in the United States consume caffeine on any given day, according to a new report from the Centers for Disease Control and Prevention. The study found that 69% of Americans ages 2 to 19 consume caffeine, but soft drinks are no longer the primary source for many younger children.

Among children ages 2 to 11, the leading source of caffeine was sweet bakery products, including brownies, cookies, cakes and pastries made with chocolate. For teenagers, coffee was the top source, followed by soft drinks, tea and energy drinks. Overall, coffee accounted for about 31% of caffeine intake among youth, followed by soft drinks at 27%, tea at 16%, sweet bakery products at 10%, and energy drinks at 6%.

The CDC also found that caffeine consumption increases with age. About 52% of children ages 2 to 5 consumed caffeine on a given day, compared with 73% of those ages 12 to 19.

Health experts caution that while there is no federally established safe daily caffeine limit for children, excessive caffeine can interfere with sleep, increase anxiety, raise heart rate and blood pressure, and contribute to headaches and other health concerns. The CDC recommends that children younger than 2 years old avoid caffeinated beverages entirely, and parents are encouraged to pay attention to caffeine found in foods as well as drinks.