So what if Americans often ask Austrians about kangaroos ? <| sep |> If you ' re a pizza deliver you ' ve failed at life <| sep |> As far as I ' m concerned he missed the train . <| sep |> As we develop in early childhood , we establish synaptic connections that develop according to frequency and necessity of use . The nerves that detect bladder stretching and ability to control urine release are mostly non existent as a baby . Same goes with anal sphincters . A baby has very little neural communication going from brain to anal sphincters and bladder . They must be built through the critical period of neurogenisis in a young humans life . Furthermore , this is the same reason why learning languageshow to play instrumentsetc is much easier as a child than as an adult . Your brain literally models itself to fit the demands of stimuli .