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ance. Among the most common traits are low muscle tone, a flat facial profile, an upward slant to the eyes, an abnormal ear shape, a single deep crease across the center of the palm, and an excessive ability to extend the joints. Other common symptoms include an extra finger with one furrow instead of two, small skin folds on the inner corner of the eyes, too much space between the large and second toe, and an enlarged tongue compared to the size of the mouth.

Most people with Down syndrome have some level of mental retardation ranging from mild to moderate range, but most children with Down syndrome learn to sit, walk, talk, play, toilet train, and do most other activities. Because speech is often delayed, careful attention should be paid to the child's hearing, as retention of fluid in the inner ear is a very common cause of hearing and speech difficulties.

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