This study examined whether child temperamental approach reactivity moderated the association between 2 factors, parenting and child control capacities and child emotional self-regulation. Participants (N=113) were 3- and 4-year-olds (M=48 months, SD=5.78) and their mothers. Emotional self-regulation was measured as observed persistence and frustration and as maternal report of compliance. Parental approach, avoidance, control, and warmth were observed during play and a frustrating wait. Child approach reactivity and control capacities (inhibitory control and soothability) were assessed via maternal report. Results suggested that maternal approach during the wait was associated with persistence and frustration, whereas maternal warmth during the play was associated with compliance. These effects, and those of child control capacities, depended on the level of child approach. The implications of reactivity-control interactions and parent-child goodness-of-fit for emotional self-regulation are discussed.