Should a 19yr old get arrested for getting a 15yr old pregnant

This is a situation that is happening now. A 15 yr old is pregnant, the 19 yr old wants nothing to do with her now. She is now due in 2 months and hid the pregnancy the whole time. They barely have money for themselves and now a newborn will come smh. She isn't telling who the guy is so they can go to court.
Posting anon just in case she has this app. So I can't answer questions. But what would you do in this situation. She is only 15 with no money. Her mom works though. I think they should go to court for child support.

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