Abstract
Development and initial validation of the Infant Reactions Inventory (IRI), a parent-report instrument for assessing distress to sensory stimulation in early infancy, is reported. The final version of the scale contains 15 sets of questions, three items in each set, with all items averaged for a single Distress to Sensory Stimulation score. Evidence for convergent validity is provided by correlations with some scales of the Infant Behaviour Questionnaire. The IRI provides a useful tool for the assessment and identification of individual differences in response to sensory stimulation during early infancy.