After I leave the hospital, what danger signs do I look for that would indicate that my baby is having a problem related to this(Congenital heart disease) condition?

Rapid breathing is one sign that might indicate a potential heart problem in a baby. This is usually caused by excessive blood flow to the lungs, although occasionally it may be due to a lower than normal oxygen level in the bloodstream. Other signs that might indicate a potential heart problem in a baby would include unusual color changes, such as a bluish or pale appearance to the skin, poor appetite, or unusual irritability.