Answer
Depends on your ages. You don't say how old the both of you are. If the guy is only in his teens or eary twenties he may not want children right now, and if you are older than your teens, that's both of you are older, then sit down and ask him if talking about the future with the him would pressure him. Don't talk about the children right away, find out how he feels talking about the future, and if he doesn't mind, bring the subject up.
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