The idea of a "magic" interaction ratio (five positives for every negative) has become widespread. No studies have directly examined interaction ratios in the context of relationships of mothers and young children. Data were collected with mothers and their young children in a laboratory setting. Baseline ratio levels for this sample were approximately one positive for every one negative. After baseline brief instruction was provided, in which mothers were asked to maintain a 5:1 ratio. All participants improved their ratios; half the sample achieved the target ratio. Mothers altered their ratios primarily by boosting their use of positives. (Contains 3 tables.)