<prompt> Infantile polycythemia is seen inCerebellar haemangiomaRetinoblastomaHepatoblastomaAll  <response>: In pediatrics, polycythemia is usually secondary to chronic hypoxia.Secondary causes of pediatric polycythemiaCyanotic congenital heart disease o Brain tumor Cerebellar hematzgiomaChronic pulmonary disease -- Cystic fibrosis o Cushing diseaseHigh altitude o HydronephrosisRenal tumorCauses of neonatal polycythemiaTwin-twin transfusion o Trisomy 93,18 or 21Maternal-fetal transfustion o Adrenogenital syndromeChronic intrauterine hypoxia o Neonatal Graves diseaseDelayed clamping of umblical cord o HypothyroidismInfant of diabetic mother o Beckwith-wiedemann syndromeInfant of a hypertensive mother or these on propranolol 