Down syndrome is associated with an increased likelihood of which congenital abnormality that can affect survival?

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The key idea is that congenital heart defects are the most impactful congenital abnormality associated with Down syndrome when considering survival. Individuals with Down syndrome have a higher risk of heart defects, especially atrioventricular septal defects, along with other defects like ventricular septal defects. These heart problems can lead to heart failure and poor growth in infancy, which can affect survival if not addressed. Advances in early detection and surgical repair have greatly improved outcomes, making heart defects the main factor that influences survival in these babies. While other anomalies such as cleft palate, spina bifida, or renal agenesis can occur, they are not as strongly linked to Down syndrome or as critical for survival as congenital heart disease.