I think the trend toward hyper-realism in dolls started in the 1970s with the introduction of Kenner's "Baby Alive" doll which ate, drank, and wet its diapers.
The latest evolution of the trend is Baby Glutton, the breastfeeding doll. According to thingamababy.com: "Your child wears a colorful bra-like halter-top featuring flowers over the nipple area. When the doll is lifted to the flowers, it makes a suckling motion and sound." A little too realistic, perhaps?