All relationships have baggage if you are older than 25.
How much hassle is your BF having to put up with now? Is he having to deal with constant chaos? Sometime chaos?
Honestly I think before you can decide you need to spend some time with the child. I hear what others are saying about not bringing a person into a child's life that will later leave and I get that to a point, but how are you supposed to decide when you haven't even been around it? Couldn't you just be introduced as a friend rather than girlfriend?
I couldn't make this decision without getting some one on one time and see what the interaction is like with the ex.