Past studies have demonstrated an association between maternal depression and poor management of pediatric asthma. Using an instrumental variables strategy to address the endogeneity of depression treatment, I build on this literature to answer the question of whether treating maternal depression leads to an improvement in pediatric asthma management. I show that treatment of mother's depression improves management of child's asthma, resulting in a reduction in asthma costs in the 6-month period following diagnosis of $798 per asthmatic child whose mother is treated for depression.