| Abstract: | Although reports of individual differences in reactivity have recently emerged in the literature, information is still lacking on the ontogeny and stability of this phenomenon over the first months of life. To address this issue, the responses of 40 newborns to PKU screening at 2 days of age were videorecorded. At 2 months, when the infants received their first DPT shot, their behavior in response to the inoculation was also videorecorded. Besides duration of crying, the intensity of fussing and grimacing was determined. Irrespective of birth characteristics, measures of reactivity were related over the first 2 months of extrauterine life. (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
