<human>:  Who was Donald Winnicott?
<bot>: Donald Winnicott was a British paediatrician who developed the theory of object relations. His main contribution to psychoanalysis was the idea that a child develops an internal representation of the mother as a source of comfort and security. He believed that this representation is an internalized part of the child’s self, and that it is important for the child to develop a healthy relationship with this internal representation of the mother.