Blue Baby Syndrome is a term that is the nickname or category of several different diseases:

These include:

• cyanotic heart disease
  • the tetralogy of Fallot
  • transposition of the great arteries
  • hypoplastic left heart syndrome
• methemoglobinemia

Its name refers to the symptom that occurs when infants contract these diseases -- their skin turns a noticeable blue in response to their heart troubles.