Caption:
The beauty of childhood; an unrecoverable stage in man's life.
Justification.
From the painting above, the children were playing with sand which signified zero state of responsibilities. That's to say, they weren't occupied with anything, since nothing is bothering them. Their parents are the ones responsible for their up keep, and they are also free to do whatever they like, because they are children. That's the beauty of childhood stage, where parents are solely responsible to their children.
Still from the painting in my own perspective, I believe the girl child standing beside the children, was trying to reason how will life after childhood stage looks like. Where they( the children) will have to take full responsibility of themselves, for it's no longer mummy or daddy's responsibilities as it used to be. That's to say, the childhood stage is unrecoverable. No going back after it has being passed, because once gone, it's gone forever.
Thanks you!