Infant acute lymphoblastic leukemia (infant ALL) is known for its poor prognosis. Current treatment protocols include aggressive chemotherapy and allogeneic stem cell transplantation but prognosis remains poor. Immunotherapy is a new approach with promising results. CAR-T cell therapy has recently been approved for relapsed or refractory childhood ALL but lacks documentation regarding infant ALL. We describe here two cases of patients suffering from infant ALL who were treated with CAR-T cell therapy, the feasibility and efficiency of treatment and their outcome.