You read about people doing all sorts of weird things, many of them for some sort of publicity or the other. If you read some of the facts listed in Ripley's books, or even the Guinness World Records, some of those exploits seem so weird. But most of those are done by adults who want the publicity.
When a young child does something that seems weird, the immediate need for doing that act is blamed on the parents (since it is assumed that the parents are the one who are forcing the child to act, and the child is too young to do something on his / her own). Consider the following case where a very young girl (all of 3 years old) ate a lightbulb due to a medical condition (link to article):
A three-year-old girl has eaten a light bulb.
Natalie Hayhurst - who suffers from Pica, a condition characterised by an appetite for non-nutritive substances - nearly died when she consumed the inedible object, and she polished off nearly a whole brick "like a chocolate chip cookie" in the past.
Her mum Colleen told the Daily Mail newspaper: "She doesn't try to eat glass so much since it hurt her, but she will try and eat rocks and sticks she finds in the garden.