The health care provider may detect a heart murmur while listening to the chest with a stethoscope. The baby's mouth and skin would be a blue color.
Tests often include the following:
Zipes DP, Libby P, Bonow RO, Braunwald E, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 8th ed. St. Louis, Mo; WB Saunders; 2007.