The FDA, the American Medical Association and the Academy of Nutrition and Dietetics agree that aspartame is safe for children and adolescents to consume as part of a healthful, well-balanced diet that includes a variety of foods. Studies have shown that aspartame consumption does not affect the behavior of children, including those diagnosed as hyperactive or with attention deficit disorder. In fact, a New England Journal of Medicine study with pre-school and elementary school children showed that even large doses of aspartame did not affect their moods, activity levels, behavior or thinking.
It should be noted that aspartame is not intended for use by infants and very young children. Even though studies show that infants and young children digest and handle even large amounts of aspartame in the same way as adults, children this age need lots of energy for proper growth and development and should not be restricted in caloric intake. Parents should of course supervise all aspects of their children's diet, no matter what age, to ensure they are getting the nutrients and calories they need to achieve proper growth and development.