...after reading half of the book

I think, Sam had done a stupid thing, when he went to Hastings. But it's good, that he noticed, that he can't leave Alicia alone with the baby. Because it isn't only hers. But here you see too, how he grows up. When he went to Hastings he was a child, and then he cogitated and got a bit more grown-up.
What I'm confused about, is that the mother reacts so extremly, when he was not at home for one night. I mean, he's 16 and a boy and I think, not every mother would call the police so quickly. And I think, you can see here very well, that he's not that independent and grown-up like other boys in his age.
If I had to ask one of the characters in the book, I would ask Alicia why she want to have the baby without thinking of an abortion. Because if I would imagine, what I would do in Alicia's stead, I had to think about it a lo, because of my schooling and career. But she doesn't want to go to college, so maybe it's not that fatal for her.