This illustrated booklet describes the physical, social, cognitive, sensory, and motor development of the typical infant during the first 12 months of life. Each of 12 chapters is concerned with successive months in a child's first year and is divided into three sections. Specific stimulating activities (i.e., handing toys to the infant's alternate hands) which parents can do with their infants are suggested and illustrated with photographs. Detailed instructions and diagrams are included for the construction of toys made from household materials. A brief discussion of an infant's expected developmental progress in each month is found in each chapter. A sample form for recording an infant's initial motor, sensory, social, and language achievements is provided. Throughout the booklet, parents of infants are encouraged to promote confidence and exploration by providing successful and pleasant experiences. (BRT)