In korean playtherapy settings, playtherapists have paid increasing attention to infant playtherapy. However, There aren't yet many intervention programs and knowledges about playtherapy for infant and their parents. Therefore, this study aimed to investigate important factors that influence the development of infant intervention program, specially it is focused of developmental transition and context in infancy, consideration about primary parenting relationships, prevention programs in infancy, benefits on multi-disciplinary approaches, and finally, diagnoses on infant mental heath and developmental disorders.