On the way home from school, at the first half of the movie, the six children stop to go skinny dipping. One boy and 2 girls are seen nude from the rear in this brief scene.
There is also a scene near the end of the film where the young girl (5?) turns to wave from a boat, exposing the left of her chest as the swimsuit is out of place.
A girl's (12) chest partially seen in one scene. She's tied by boys, one of them is slowly pulling her skirt up, then other boy pulls her shirt and puts a frog inside.