My boyfriend said he would give me a bride price when the child was born. Why?

The situation you are talking about is probably the situation that many people talk about now: having children first and then getting married. Nowadays, a large number of girls have been married for many years without having children, and the elders are very anxious. Maybe your boyfriend is one of them and has the same idea. He hopes that after you give birth to the child, he will give you a gift and get married. Such a man is too chauvinistic. He treats girls as reproductive tools and does not respect girls at all. If you want to live with such a boy for the rest of your life, you have to think carefully about it.