That's interesting. It could be because you're falling asleep thinking you're gonna see that baby again, or you're thinking "I hope I don't see that damn baby," consciously or subconsciously. That could easily be the cause, in which case, all you have is to go to bed thinking about other things. Try falling asleep thinking about something going on with school or friends, think about your day, about something you haven't done in a while or something you've always wanted to do. Just fall asleep with something in mind that has nothing to do with the baby, and you shouldn't have that problem anymore. To make it easier to stay on that train of thought, make sure it's something you may be having trouble with in life.
When we dream our minds try to solve all sorts of issues we try to deal with throughout the day, and if you're one issue is "what am I gonna do about this baby," you're boned. But if you have something important, some problem, going on in life that needs solving, it'll be easy for you to stay on track while awake. Then all you need to do is create a scene in your mind, work through it, let it replay as much as it needs, until finally you drift to sleep and your thoughts are carried over to your dreams.
If you do this, your problems should be solved. You just have to really understand that it's all your own doing, and not some demon trying to mess with you. Otherwise, you're gonna find the whole situation hopeless and it'll continue to dominate your dreams.
