Answer: Methamoglobinemia
Explanation: This is a blood related disorder in which the an excess amount of methemoglobin is generated in the body. This is usually seen in infants and also known as blue baby syndrome.
Hemoglobin is the protein in blood( RBC) which carries and sends oxygen to the different parts of the body.
Methemoglobin is also a part of hemoglobin in which the nitrate binds with hemoglobin and makes the body appear blue.