Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to help a child with down syndrome [title] Learn what down syndrome is. [step] Down syndrome is a genetic disorder. It happens when someone is born with an extra copy of chromosome 21.

Ending1: This extra genetic material affects a person's development. [substeps] Down syndrome causes changes in physical development. Ending2: It is characterized by sleep problems, mental and physical symptoms and potentially even psychological disturbance. Unfortunately, all people have down syndrome, even in children. Ending3: The child with down syndrome gets unwanted chromolots. Certain genetic characteristics such as skin color, hair color, face shape, posture, eye color, clothing, size, and demeanor cause this syndrome. Ending4: It can happen to anyone under 14 and toddlers can also suffer from down syndrome. It can affect the optic canal, our eyes, joints, muscles, and even the cognitions later on.

Answer format: ending1/ending2/ending3/ending4