No matter what you spout, it is not good to give a child caffeine or too much sugar.
Kids and Caffeine NA3-5
Is it healthy for children to consume caffeine? Many health care providers, especially pediatricians, recommend that children avoid or limit caffeine use. Caffeine is absorbed very quickly in the body and then passes into the central nervous system.
Caffeine in low doses can affect the body, such as decreased appetite, increased urination, and insomnia (difficulty sleeping). Toxic effects such as nausea, vomiting, diarrhea, cramps, muscle twitching, and agitation can begin with consumption of as little as 4.5 mg of caffeine per pound of body weight (114 mg in a 25 lb. child). Severe caffeine toxicity can lead to seizures, an increased heart rate and an irregular heart beat. "Caffeine sensitivity" refers to the amount of caffeine that will produce negative side effects and this amount varies from person to person. Caffeine does not accumulate in the bloodstream and is excreted in the urine within hours of being consumed.