Unfortunately the information that you have provided is too limited to tell you anything about your infant's heart issue. Holes can be present in the wall between the upper heart chambers (ASD) or the lower heart chambers (VSD). A 6 mm defect in either location would be moderate in size at this age. Symptoms are highly unusual in the typical ASD, but can be present in the VSD patients even at a young age. The "blueness" could be related either to the congenital heart defect or to breath-holding. A resting heart rate of 179 bpm would be high, but if the child was agitated or crying that can be normal. It sounds like you need to review your child's condition with a pediatrician familiar with congenital heart disease. It could potentially be something serious. Treatment options will depend upon the type of hole present.
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