It’s his baby, too.
And it's her body. She gets to say what happens to it.
She cold hand it over to him like a (surrogate) and fight for the law to absolve her of all future responsibilities.
Only after having carried the baby for 9 months, put her health in danger, messed up her career prospects, and gone through childbirth. Why should she be forced into all of that?
She didn’t use contraception either. Equally to 'blame'.
We don't actually know that. But even if she did, she was 16, he was older, and it's irrelevant to the fact that he shouldn't be permitted to dictate what happens to her body.