The child shown below is suffering from a congenital hea disease. Which congenital hea defect is seen most commonly seen in these children?

This child is suffering from Down syndrome. Impoant 'must know' facts about Down syndrome: - Trisomy 21 - MC - d/t maternal meiotic non-dysjunction - Risk increase with increase in mother's age - QMc hea disease in Down syndrome - AVSD (Atrioventricular septal defect) aka Endocardial cushion defect