An acute B-lymphoblastic leukemia occurring in children. The disease is B-cell childhood acute lymphoblastic leukemia (Monarch Disease Ontology identifier MONDO_0000872). Also known as: B cell childhood ALL, B cell childhood acute lymphoblastic leukaemia, B cell childhood acute lymphoblastic leukemia, B cell childhood acute lymphocytic leukaemia, B cell childhood acute lymphocytic leukemia, B cell paediatric ALL, B cell paediatric acute lymphoblastic leukaemia, B cell paediatric acute lymphocytic leukaemia.