1, usually shallow and rapid whistling, sweating, wasting, slow weight gain; 2, crying, feeding or after activity shortness of breath aggravated, and blue lips; 3, usually repeated colds and pneumonia; 4, some children have fingernails, lips and cheeks dark purple; 5, cyanotic precordial disease special posture: infants and toddlers like to bend in the arms of adults; older children like to squat; 6, some precordial disease may not have obvious symptoms, only in the occasional physical examination heard heart murmur.