I'm channeling a stand up here, but it's true, you need to move in for a week, confiscate all her make up and hair products, 24 hour mums of a baby don't have time for all that, and every 2 hours thru the night, you need to turn the stereo up to 11 and poke her with a stick til she gets up... set fire to all the money she has in her purse, then find some of her most treasured possessions and smear peanut butter and dribble all over them...
After a week ask her if she still wants a baby, or whether she'd prefer to keep her partner instead.
Personally, I always use condoms, because I think babies are the most terrifying STD that ever was.