Did you follow the proper COURT procedure for moving such as filing notice of relocation with the court 60 days before the move telling the court your new address and what not? How long have you lived in Indiana? Your ex can force it so that his child is returned to KY -- you would nto necessarily have to move back but your child would have to which means the baby would be living full time with his dad and you could visit.
Parents should remember 3 things: Love your kids more than you hate your ex; when you have children the relationship with the other parent is until death; your children determine what type of nursing home you end up in.
Nothing stated by me should be taken as giving you legal advice or forming an attorney/client relationship.
Attorney-GAL in Ohio.
I've removed the knife from my back, polished it, and will one day return it -- long after you think I have forgotten.