The transitional object as originally defined by Winnicott is important during a period between oral erotism and true object relationship. These objects are not part of the infant's body nor are they fully recognized as belonging to external reality. They may be said to occupy a position between the thumb and the teddy bear. They are used at bedtime to soothe as defense against anxiety, they are not alterable or replaceable, and have a name given them by the child, etc. Fink presents clinical observations of a child whose pacifier fulfilled all the criteria of the transitional object. He proposes that a pacifier can be used as a transitional object. The literature on transitional objects is reviewed.