Hay and Vespo found parents teach children to love them via modelling attachment such as hugging them or family members. Children also rewarded with approval when they display attachment behaviour of their own
Some element of conditioning could still be involved
Learning Theory is not a good explanation but some aspects of human development are affected by conditioning. Feeding theory is a problem but there is some credibility with the association between primary caregiver and provision of comfort which is the part that builds attachment
Studies show best quality of attachment are with sensitive carers that pick up instant signals and respond appropriately. If cupboard love is the explanation then all these complex interactions have no purpose
Learning Theory ignores other factors associated with forming attachments
Research into early infant-caregiver interactions suggests the quality of attachment is associated with factors like developing reciprocity and good levels of interactional synchrony
Research with humans show feeding is not an important factor in humans. Schaffer and Emerson's study showed babies developed primary attachment to mother even though others did most of the feeding
Range of animal studies show young animals do not necessarily attach (imprint) to those who feed them. Harlow and Lorenz's research show that animals do not create an attachment bond with their parent because of feeding which can also apply to humans.