Hy to all i am searching about a old movies:

a film about a group of children who ran away from home, in a scene one of the girls she gets her first period, and most of this talk in a pier, and delivered to the authorities, and when the mother seeks in the police barracks gives you a beating in the face.

If not in the same movie but when they are staying in a motel for the night, one of the kids are in their underwear.

The movie is like 80's, drama and adventure, not if it's Disney??, and only saw him once on local television.

Is a familiar movies with some rare theme.