RecruitingDrug trialTINI 2: Total Therapy for Infants With Acute Lymphoblastic Leukemia IIThe purpose of this study is to improve upon the TINI study treatment. The study will test the ability of a type of immunotherapy called blinatumomab to clear persistent leukemia. Blinatumomab targets CD19 which is located on the leukemia cells outer membrane.