Jonah was watching a show where the characters were visiting a dairy farm and exploring how dairy products are made. In the beginning of the show, one character looked into the camera and asked "Where DOES milk come from??" And then paused for the children viewers to reply.
Jonah jumped off the couch in excitement and shouted "Mama's boobies"
Maybe we need to work on talking about where the milk in the white jugs comes from.