<prompt> The most common malignant neoplasm of infancy isMalignant teratomaNeuroblastomaWilms tumorHepatoblastoma  <response>: Neuroblastoma is the most common extracranial and intra- abdominal solid malignant tumor of infancy.It is a disease of early childhood with approximately 90 of patients presenting before 5 years of age almost 50 within the first 2 years of life. Reference:Essential pediatrics-Ghai,8th edition,page no:616. 