Normal toddlers indicate a preference for interacting with other normal toddlers, seeking them as partners and more often rejecting social initiations from handicapped children . . . parents, fearing social failures for their children . . . contribute to [their children’s social inhibition] by being overprotective . . . mothers ignored their handicapped children during free play at a much greater rate than did mothers of . . . normal toddlers . . . significantly, the five most ignored children all had facial rather than orthopaedic anomalies . . .1