Chemotherapy is the one and only additional treatment that participants under 3 years of age can receive in this study. After the first 2 cycles, response will be evaluated, including all exams done at screening before you continue on treatment, if needed. Further surgery will be considered after these exams. If both you and your doctor choose to consider further surgery and agree for the procedure to be the next appropriate step, you may undergo a second surgery to remove anymore remaining tumor. After the second surgery, the chemotherapy will be again continued on the same schedule for 4 more cycles. If you did not require further surgery, you will continue on with the chemotherapy as previously planned.