I have a friend who has an 11 year old son. She has gone from the relationship with her husband, to a divorce, to dating a chick for 3 years and now has dated 4 guys within the last year. All the while introducing her son to them all too quickly. That, I feel is not right at all and there have been some serious issues because of it. However, I have another good friend who was always very good about waiting until she knew the relationship was right and what she wanted before she introduced her kids to him. Now, they're practically a family and moving forward to being a full time family and for that, I couldnt respect her more. That's how it should be done.
In your instance, having the kid brought into the equation is too soon in my opinion, let alone having it sleep in the same bed as you.