Quote from Kevin in A.A.R.M.
Oscar: Hey. Did you manage to feed him? I don't know what it is. He just keeps spitting out the nipple. Dwight K. Schrute: That is because this baby is of superior intelligence. He can tell when he's being tricked out of the experience of a real human breast. Kevin: He's not that smart. He doesn't know where I hid his duck.