AbstractThis investigation examined the relation between features of the home environment (HOME Scale) and domains of development (Griffiths Scales) in 6‐month‐olds. The sample consisted of 155 families with diverse demographic characteristics who were part of a larger study. Data were analyzed using hierarchical multiple regression. More favorable eye‐hand development was associated with more availability of appropriate play materials. The interaction of appropriate play materials and maternal involvement was related to both social and hearing‐speech development. For the infants who had high exposure to appropriate play materials, social and hearing‐speech development was more optimal if their mothers were highly involved with them. The analyses were conducted separately for low (n= 87) and middlelhigh (n= 55) socioeconomic status groups from the sample. Partial replication of the interaction effect was present for the middle/high group, but not for the low group. Findings support the importance of examining interaction as well as additive effects of the impact of early environment for relatively large samples in which there is a diversity of ex