Whether premature heartbeats are dangerous for children depends on the specific type of premature beats. If they are simple atrial or junctional premature beats, occasional ventricular premature beats, and the child’s heart rate is within the normal range with no obvious discomfort, most of them are not dangerous for children. However, if the child has frequent ventricular premature contractions, more than 6 per minute, with symptoms such as palpitations and weakness, especially if more than two ventricular premature contractions occur in a row, it is dangerous and can easily induce ventricular fibrillation and lead to sudden death.