I think it's normal. Everyone dreams about that at some point, because it's something that is at least a future possibility for most of us. Maybe it happens more for women, because of hormones, but even I dreamed that I had a little girl I needed to save from something (zombies, probably), and I'm a guy.
Dreams are just your subconscious' way of dealing with stuff that goes on in the background of your mind in the daytime. So if you're exposed to and/or thinking about babies a lot while you're awake, you're bound to dream about them. Maybe it'll stick with you for an indeterminable length of time, or maybe it's just a passing phase. Who knows? Either way though, I wouldn't worry about it.
Dreams are just your subconscious' way of dealing with stuff that goes on in the background of your mind in the daytime. So if you're exposed to and/or thinking about babies a lot while you're awake, you're bound to dream about them. Maybe it'll stick with you for an indeterminable length of time, or maybe it's just a passing phase. Who knows? Either way though, I wouldn't worry about it.