The caffeine in coffee has much more serious effects in children than adults. Kids who have coffee or highly caffeinated drinks can exhibit more extreme versions of the symptoms that affect adults, including restlessness, irritability, sleeplessness, rapid heartbeat, irregular heartbeat, rapid breathing, vomiting, nausea, and ringing in the ears. Studies also suggest children who drink lots of caffeine are more likely to accidentally wet the bed than children who do not.

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