Fixation time, smiling, vocalization, and fret/cry were recorded to obtain a complete picture of infants' responses to facial stimuli over the first year of life. Four stimuli were presented to 120 infants. Results of fixation data indicate that (1) there is a marked decrease in fixation toward facial stimuli within the first year, (2) at all ages boys look longer than girls, and (3) in the first half year realistic stimuli were preferred, and in the second half year nonrealistic stimuli were preferred. The results of smiling and vocalization were parallel: (1) both increased over the first year, (2) girls smiled and vocalized more than boys, (3) realistic facial patterns elicited more smiling and vocalization regardless of age. Fret/cry data were included to determine if stimuli would elicit consistent fear or unpleasant responses. Results indicate (1) a decrease in fret/cry over age, (2) that boys show more fret/cry than girls, and (3) that stimuli fail to elicit consistent or observable fear responses. The difference between the measures suggests that the responses are under the service of two systems, one affected by familiarity and novelty; the other, by innate releasing mechanisms or social learning. (DO)