“While caffeine can make any of us a little jittery, it can have more noticeable and even serious side effects at smaller doses in kids,” says McGrane. “For example, too much caffeine in kids can lead to increased heart rate, increased feelings of anxiety, difficulty concentrating, and an upset stomach. Another aspect to consider, especially in toddlers, is that coffee can mask hunger cues, so toddlers may not get the nutrition that they need for growth and development. Finally, keep in mind that coffee itself is quite acidic, and as a result can damage tooth enamel and increase the risk for cavities.”