As a subject matter expert in pediatric health, I can provide you with an accurate explanation of "blue baby syndrome." This term historically referred to a condition known as congenital cyanosis, where infants would appear blue due to low oxygen levels in their blood. However, the term is most commonly associated with a specific type of congenital heart disease called Tetralogy of Fallot, which includes four defects that cause a decrease in the amount of oxygenated blood reaching the body.

The four defects in Tetralogy of Fallot are:
1. Ventricular septal defect (VSD) - a hole between the two ventricles of the heart.
2. Pulmonary stenosis - narrowing of the pulmonary valve and the outflow tract of the right ventricle.
3. Right ventricular hypertrophy - thickening of the right ventricle's walls.
4. An abnormal positioning of the aorta - the aorta is shifted to the right and receives blood from both ventricles.

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Blue Baby Syndrome. Blue Baby Syndrome - An illness that begins when large amounts of nitrates in water are ingested by an infant and converted to nitrite by the digestive system. The nitrite then reacts with oxyhemoglobin (the oxygen-carrying blood protein) to form metheglobin, which cannot carry oxygen.read more >>