This study provided a telehealth program for kindergarten and nursery teachers in charge of children with, or suspected of having, developmental disabilities. We examined teacher participation, behavior intervention plans (BIP), practice, and improvement of children’s behavior. Six sessions of online lectures and two online consultations based on functional behavioral assessments (FBA) were held. All ten teachers conducted the FBA, and seven created the BIP. Additionally, six out of seven teachers recorded their children’s problem behaviors, showing improvement in the problem behavior of these children. Moreover, the non-targeted problem behaviors also showed improvement following the intervention.