I am looking for input from others in regards to their children and experiences with eating/chewing objects.

My 3yr old boy still likes to put anything and everything into his mouth, it seems purely for enjoyment. He knows he is not allowed to do so and gets in trouble when he has chewed on his books etc, he just really likes putting things in his mouth.

Has anyone else had a child his age that does the same or similar? If so what did you do about it, if anything and if they are now older, when did/have they grow/n out of it? Was/is there an actual reason why they done so?