Current conditioning can explain why babies cry for comfort. Crying leads to a response from the caregiver, for example, feeding, as long as the caregiver provides the correct response, crying is reinforced. The baby then directs crying for comfort towards the caregiver who responds with comforting social, suppressive behaviour. This reinforcement is two way. At the same time, the baby is reinforced for kept for crying. The caregiver receives negative reinforcement because the crying stops. The person supplying the food is the secondary reinforcer and attachment occurs because the baby wants the reward of food from them.