What is Down syndrome? What causes it? What are the symptoms?

Patient's question:

No

Doctor's answer:

Down syndrome is the most common chromosomal disorder causing congenital intellectual disability, also known as "congenital idiocy," "congenital cretinism," or "trisomy 21," and is commonly referred to as "fool." It is caused by the variation of chromosome 21 into a trisomy during the formation of reproductive cells in parents or mothers due to various factors.