We used data from a sample of ethnically diverse first-time parents (N = 186) in the United States to examine differences between mothers’ and fathers’ challenging parenting behavior (CPB) when infants were 9 months old as well as covariates of CPB. We also examined associations between CPB and infants’ social competence and behavior problems when they were 12 months old. Results showed no differences between mothers and fathers in the level of CPB with their infants. Mothers with more depressive symptoms engaged in more CPB. Over and above the contributions of infants’ gender and temperament and parents’ education, mothers’ and fathers’ CPB was not associated with infants’ social competence and behavior problems. This study expands our understanding of the universality of CPB and whether it is associated with social competence in ethnically diverse families.