Attachment theory made infant bonds central to psychology, and critics still push back
John Bowlby argued that babies are built to cling to at least one reliable caregiver, and that this bond shapes emotional life for years. His idea became one of psychology's dominant frameworks, yet it rests partly on assumptions about mothers and families that anthropologists have since challenged.
The British psychiatrist and psychoanalyst John Bowlby, who lived from 1907 to 1990, proposed that infants need a close tie with at least one primary caregiver, both to survive and to develop healthy emotional and social lives. Infants seek closeness to that figure, especially under stress, and secure bonds form when caregivers respond sensitively and consistently, above all between six months and two years of age. Growing children then treat the caregiver as a secure base, venturing out to explore and returning for comfort. Quality of engagement matters more than sheer hours together, and the role can be filled by anyone who reliably behaves in a mothering way.
In the 1960s and 1970s the developmental psychologist Mary Ainsworth extended the work, highlighting the secure base and the effect of a mother's responsiveness to distress, and describing patterns now labelled secure, avoidant, anxious and disorganised. From the 1980s researchers applied the theory to adult relationships too. The modern version rests on three claims: people have an intrinsic need for one-to-one bonds, regulating fear and emotion sustains vitality, and attachment fosters adaptation and growth.
Bowlby framed attachment as an evolved instinct, pointing to primate infants, but he did not separate species that pass babies around freely, such as marmosets and tamarins, from those that rear young one-to-one, like gorillas and chimpanzees. Without ethnographic evidence he imagined early human infants always carried by their mothers and wrongly assumed hunter-gatherers still lived that way. Drawing on English families, he called the single primary bond monotropy and treated it as universal, whereas worldwide most children have many carers from birth.
Criticisms have accumulated, around temperament, measurement, social complexity and blaming mothers. As direct observational support weakened, the theory shifted toward internal working models, mental frameworks of expectations about oneself and others, though these still lack an agreed definition. Even so, attachment theory has shaped therapy and childcare and social policy.
Source: Attachment theory
