remember everything happens for a reason. I got pregnant a month after me and my then boyfriend, now fiancee got together. follow your heart and if its meant to be, it will be. good luck.
How does him having a child already mean he'll be by your side? Obviously he's not with that child's mother. So that point is mote.
Yes, you are moving too fast. It's only been 3 months. That's not even enough time to know his favorite color or favorite food. I would suggest actually dating first. Right now you're in the "honeymoon phase" of dating where everything is grand and merry. Wait until after a year, 2 years or 3 years....then see if you still want a child with him. As time wears on you'll see if he really is this terrific guy or you'll find out why he and his first childs mother split up. Remember a child is a bond for life. Once you bring a life into the world with this man you are tied to him forever. If it turns out he's not so great, you'll still have to deal with him b/c of the tie to the child.