Neonatal cyanosis is most commonly due to pulmonary and cardiac disease. Neonatal Methemoglobinemia is rare cause of Neonatal cyanosis. Methemoglobinemia not attributable to any drug or oxidant, has been described in neonate following gastroenteritis. Methemoglobinemia usually present with cyanosis,so always create diagnostic quandary. We report a case of methemoglobinemia in a neonate following diarrhea.