i reffed a small kiddies game yesterday.
Player headed it and ball went into his goal 2 seconds later.
free kick or play advantage?
Their very young. Do you want to be introducing complexity to children so young? Heading it might be a indirect free kick, or it might not!
As a ref I would give an indirect free kick. As a coach of a kids team in an age group that is affected by this rule, I would expect one because it is there to prevent kids heading the ball, the action of heading is to be prevented by the rule - No heading indirect free kick.