Blue baby syndrome is when your baby’s skin is a bluish color. Learn more about what causes it, why it’s important, and what to expect. The most common symptom of blue baby syndrome is a blue discoloration of the skin around the mouth, hands, and feet. In severe cases, blue baby syndrome can even cause death. Treatment will vary depending on what is causing the baby to turn blue. Blue baby syndrome , also known as infant methemoglobinemia, is a condition where a baby’s skin turns blue. This occurs due to a decreased amount of hemoglobin in the baby’s blood. Blue Baby Syndrome is a condition affecting infants, characterized by bluish skin due to oxygen deficiency. Learn about its symptoms, diagnosis, and treatment options.