Basically if this is two minors then a mistake has been made by them (Over adventurous perhaps). A big mistake, but a mistake non the less. The age is shocking of course. That's the end of it. As to weather the baby should stay with its mother and her family, of course it should.
There is no nationality, cultural or religious issues here, because I will bet a story just like this one can be found anywhere in the world if you look.