operant conditioning - learning by reinforcement
suggesting that a hungry infant feels uncomfortable and this creates a drive to reduce discomfort
any behaviour resulting in rewards is positively reinforces and therefore likely to be repeated and any behaviour that results in punishment is unlikely to be repeated
a hungry infant feels uncomfortable(cry) and is driven to reduce discomfort and when fed they feel pleasure(reward)
food is the primary reinforcer and the caregiver is the secondary so the infant seeks out the thing that offers pleasure