Answer Posted / ishaque siddique
It is usually caused by a heart defect which laymen often called "a hole in the heart". Normally, oxygenated blood from the lungs is separated from deoxygenated blood from other tissues. A defect in the heart ventricle walls can allow deoxygenated blood to mix with the oxygenated blood . The resulting blood going through the aorta has less oxygen than usual, and the baby looks blue.
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