Little breastfeeding babies know a boob when they see one. They just can't always distinguish fake ones from real ones, as demonstrated by this image:

Of course, no one photographed what happened afterwards. The baby started to cry because he wasn't getting the milk he wanted. Then the statue, in a manner befitting a Ben Stiller movie, came to life and said, "Ouch! Dang kid, that hurts. And don't cry at me. I don't know why you're not getting the sustenance you need from this here cold, marble breast." At which point a statue lactation consultant was called in and told the statue woman that, in fact, her nipples are inverted and she must wear one of those annoying plastic shields in order to draw them out so baby can eat.

At which point statue woman said, "Eh, screw it. Give the kid formula." 

Photo Credit: Weird Asia News