Congenital Methemoglobinemia in Neonate—An Easily Missed Cause of Cyanosis

Congenital methemoglobinemia is a rare diagnosis. Due to its rare occurrence in the neonatal period, its incidence is sporadically reported. Cyanosis in newborn is a common finding in day-to-day practice. It often points to either cardiac or respiratory problems. Congenital methemoglobinemia in newborn period is rare. If occurred, it is associated with severe disease. This case report highlights the importance of considering methemoglobinemia even in a newborn. The interesting feature of this case is that though the methemoglobin levels were only mildly deranged, the baby was significantly cyanosed and needed treatment from birth.