Baby Snatcher - (1992) A desperate wife fakes her own pregnancy and kidnaps a baby to pass of as hers.
It's wild. And by that, I mean WONDERFUL.
UPDATE: AND IT'S STARRING A VERY YOUNG DAVID DUCHOVNY IN A LEATHAH JACKET AND THAT GIRL THAT PLAYED JO ON THE FACTS OF LIFE!!! I'M LIZZING***
***LIZZING = LAUGHING + WHIZZING!!!