Soon after weaning at five to six months he adopted the end of the blanket where the stitching finished… This very early became his ‘Baa’… This is a typical example of what I am calling a transitional object.
Winnicott establishes the blanket-corner as his canonical exemplar of the transitional object — the infant’s first ‘not-me’ possession, bridging inner psychic reality and the external world following weaning.
, Playing and Reality, 1971thesis