Examined parenting self-efficacy as a potential mediator of effect of competence-promoting and inhibiting parenting on toddlers' scores on mental scale of the Bayley Scales. Found that effect of competence-inhibiting composite (forceful redirection of child's attention, ignoring and reinforcing misbehavior, potentially distracting self- conscious behavior, and pronounced negative responses to child's task behavior) on toddlers' scores was mediated by parenting self-efficacy. (Author/KB)