They're cartoons. Fantasy =/= reality and if your kid doesn't get that you have bigger issues than a skinny cartoon kid. If parents/caretakers aren't lazy and teach their kids how to tell the difference they won't have to worry about their kids getting bad messages from TV shows. Their biggest influence comes from the people around them. If they have a healthy support system that from the start let's them know they're loved and accepted no matter how they look and who encourage them to stay fit for health's rather than looks sake they will be fine.
Yeah, indeed. QAfter that, there was little to do to make it work. That's why everybody in the main protagonists in the first movies wore skirts as civilian clothes.