What does it mean if a guy brings up babies?

So I haven't been dating my boyfriend too too long but it's going really well. So well I'm kinda freaking out because I'm not used to it... Anyway the other day he came over my house and some of my family was there with their babies. He's never really been around kids before and I think that kinda set him off. He's mentioned that he does want kids befor, but only in passing. And we both said we don't want to be older parents. But then we had a talk and we both want kids within four years. And we talked about it for a bit then he said "I" needed to stop talking about babies before he falls in love with me.

Wtf?

Also separate question when a guy always says don't do that or ill fall in love with you/I'm gonna fall in love if you../ are you trying to make me love you/etc what does that mean?

What does it mean if a guy brings up babies?
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