he always eats my sons diapers.?

You should put bitter apple or a very spicy barbaqu sauce on it before you leave.

He probably likes the way they smell. The only thing to stop that is to throw away the diapers before you go out.

Try tabasco sauce. It won't hurt him but it will make him think twice before eating another diaper. If you're opposed to this idea, get a sturdier trashcan with a lid.

throw the diapers outside in the gargage can....