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.
Paula (Noelia Ortega, 10) runs through an empty city by night, naked except from shoes, until she is caught by a couple and covered up. Mostly rear nudity; also frontal nudity, but mostly from a distance.