This paper describes a mental health consultation program for day care centers serving children under six years. The goals of the program are discussed together with a description of the role of the day care consultant. The steps by which the program was implemented are described in detail. The impact of the program was measured on several variables by comparing centers receiving consultation with those who did not. Measurements were taken (pre and post consultation) on the children's behavior and the expressed attitudes of the teachers. Post only measures were collected from the parents and from teachers as to their satisfaction with different aspects of the consultation process. It is concluded that mental health consultation to day care can be an effective way of furthering the prevention of behavioral disturbance in young children, although the effects are difficult to demonstrate empirically. Specific suggestions are given in three areas for professionals interested in beginning a consultation program to day care. (Author/SB)