Boyfriend on the topic of kids

So for the past few days, I've been picking up my 3 year old niece from daycare and watching her until my brother picks her up. My boyfriend has been home a couple of the days she's been here. a couple days ago, after she left, he said "watching [my niece] makes me want my own kids but at the same time, doesn't". it kinda made me say "awww" because he's never really brought up the topic of kids like that on his own before, without something else bringing up the subject. now I'm trying not to have baby fever. 😧 I know we don't want and can't have kids right now, and I don't want to until we're married, but now I'm a little more excited for that time to come.