New longer-term research studies had likewise shown that bonding occurs not only if the mother cares for the child but also with the fathers (Belluck, 2011, p. 1) in which fatherhood is a crucial component in raising successfully the child and of nurturing a family.
One attachment theory developed by psychiatrist and psychoanalyst John Bowlby had emphasized the need of infants to have one consistent primary caregiver to whom they can attach normally during their social and emotional development, typically from 6 months to 2 years old. Usually, it is the mother that provides the need for an attachment figure but other people may in some cases be acceptable such as the father, the grandmother, the older sibling or close relatives.
Another prominent theory on bonding is the one developed by Klaus and Kennell which states that maternal bonding is important which in turn gave rise to the new practice of bringing a new baby to its mother instead of being brought to the nursery. The theory became controversial as they postulated that maternal deprivation can lead to maladjustments later on such as an eating disorder, personality defects, juvenile delinquency and substance abuse by a failure to bond.
I believe the attachment theory that is best aligned and integrated with my own views of attachment is the single caregiver theory. Infants stick to one caregiver during their first months of existence and any changes will result in the so-called separation anxiety as the infant grows a bit older and able to recognize faces and voices. It is therefore very vital to have only one person as the primary caregiver, maybe relieved by someone else but only for brief periods of time so as not to cause stress, anxiety, fear or other negative emotions on the baby who sees long periods of separation as a threat to its survival. The attachment theory by Bowlby is now