I'm not surprised your H is wanting to come around now that the baby's birth is closer. You have to decide the boundaries you are comfortable with regarding your son. If you don't feel comfortable w H at the birth maybe he could see he shortly after if you feel okay with that.
I disagree w some of what keep_going said. But, this could be the window of opportunity for you and H to re-establish some sort of congenial R. It IS better for your kids to have a good R with their dad, but I agree he has done NOTHING to convince his Ds that he is worthy of their time/love.
But, your S is starting from scratch, so to speak. Your H has the opportunity to make changes. However, I hope he realizes it is your D's that will remember this time. It would be hard on them if suddenly their dad is coming around just for the baby.
I also think you've done an amazing job putting out fires all over the place where your H has involved the girls in very inappropriate conversations. You do NOT need to take any ownership of the over-involvement they've had in the details of your M. You deserve a gold medal for what you've dealt with!
SB, whatever you decide is okay. You need to feel good about what you're doing.
Question--if your H started coming around due to son's birth and this led to him realizing what he's missing, would you still want him back? You love him, I know, but could you really get past all that he's put you through? Really think about this.
(((((HUGS))))))
M- 18 T-21 S-14,11 & 10 BD 6-18-2012 (OW-EA) H moved out 11-3-2012 10-5-13 Me- I want a divorce. I want to move on w my life. 11-25-13 Jointly filed.