Because he's my son

Last night on the couch we, my wife and I, asked our son, "Do you know how many people are going to be in your family?" He thought for a moment then began counting. "One," he pointed to himself. "Two," he pointed to me. "Three," he pointed to my wife. "Four," touching her belly. "Five and six," as he then pointed to both her breasts. In his defense, her naturally lovely DD breasts have begun their magical transformation to the legendary DDD status and I guess babies living in breasts are about as realistic to a child as a babies living in stomachs. I thought I was chuckle worthy anyway.