Magnets are cool and fun to play with . . . Magnets can also cause serious bodily injury / personal injury in children. If a child swallows two magnets, the magnets could work in force to damage organs and other internal body parts.
The Consumer Product Safety Commission even warned about the dangers of magnets at the Hidden Danger of Magnets.
It is important for parents and caregivers to supervise small children who play with magnets. Otherwise, serious bodily injury / personal injury can result from the inattention combined with the curiosity of a child.