Data for the paper "The role of maternal sensitivity, infant temperament, and context in the development of emotion regulation". The dataset includes information on emotion regulation tasks (2 frustration and 2 novelty contexts for each ID): type and duration of each task, intensity of child distress (range 0-5) showed in each task,  percentage of the time spent by the child in soothing behaviours, distraction and communicative behaviours. Additionally, the dataset  includes the temperamental group each child belongs to (low and high negative reactivity) and the level of sensitivity shown by mothers during each task (range 1-5).