Reports a study of 110 newborn infants' responses to the heelstick procedure to draw blood samples, and of the responses of 40 of those infants to their first inoculations at two months of age. Discusses measures of distress; stability of reactivity across time; and individual differences and health of the infant as factors in reactivity. (NH)

Examined infant crying and resistant behavior in response to requests to clean up toys. Infants' irritability and outbursts peaked at 18-24 months. Although crying was a relatively rare phenomenon in the third year, resistance behavior was common. Decreases in crying may be linked to acquisition of language. (BG)