Harlow showed babies don't bond over food
In the 1950s, psychologist Harry Harlow gave infant monkeys a choice between two mothers. The result overturned a theory that had shaped child-rearing for decades.
The dominant view in psychology through the mid-twentieth century was straightforward: infants bond with whoever feeds them. Love, in this account, was learned through the reduction of hunger — a secondary drive that tagged along with the breast or bottle.
Harry Harlow at the University of Wisconsin doubted this. In 1958, he gave newborn rhesus monkeys two surrogate mothers: one made of wire mesh holding a milk bottle, one covered in terry cloth but offering no food at all. Both were available at all times.
The monkeys spent almost all their time with the cloth mother. When frightened — Harlow would place a mechanical toy in the cage — they fled to the cloth mother, clung to her, and only then ventured back toward the threat. With only the wire mother present, they froze in corners, rolled into balls, and screamed.
The cloth mother provided what Harlow called contact comfort. It turned out that warmth and something to hold onto were not secondary rewards — they were primary, independent of feeding entirely.
The finding helped dislodge a child-care orthodoxy that had discouraged parents from picking up babies too much, lest they spoil them. What Harlow's monkeys needed, and what the research suggested human infants needed too, was physical closeness — not as a reward for being fed, but as a biological requirement in itself.