Well, I'm closing in on sixty -- another couple years, if my body lasts, although I wouldn't bet good money on it :( and I can answer that question.
Back when we were kids, there was no such thing as a rare-earth magnet. A tiny neodynium magnet -- smaller than your fingernail -- will be several times stronger than a fairly large alnico magnet we grew up with.
A strong man will have difficulty separating two of them stuck to each other. In fact, they are usually chrome plated -- not for appearance, but to protect them. The protection is not perfect, though. If you allow two of them to snap together, they will collide with such force as to shatter them. The chrome will hopefully prevent the pieces from separating and shooting into your eye at incredible velocity. They are THAT powerful.
Two of them, in a child's small intestine, will very likely grab onto each other through two loops of the gut, crushing the thin intestinal tissue, cutting off blood flow completly resulting in necrosis, and, if not treated soon -- via surgery, death. A slow, painful death.
What kind of maniacs use neodynium magnets in toys?? I am working up a prototype product using 1/4 diameter ND magnets, and I am amazed at how dangerous they are. They have roughly 35 times the attractive power of an equivalent-sized traditional magnet. With proper support, an ND magnet the size of a dime can suspend a 3 1/2 pound drilling hammer firmly from the ceiling with no risk of falling. At the least, ND magnets can pinch the heck out of your fingers. I have old tough hands, but a small child could be seriously injured just by handling them, let alone eating them.