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What are the characteristic symptoms of Down's syndrome.

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Symptoms of Down's syndrome:
1. Typical facial features resembling the face of a Mongolian race.
2. An epicanthal skin fold, over the inner corner of eyes causing downward slanting eyes.
3. Typical flat face rounded flat nose, mouth always open with protruding tongue.
4. Mental retardation.
5. Poor skeletal development.
6. Short stature, relatively small skull and arched palate.
7. Flat hand with simian crease that runs across the palm.
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