Common symptoms of Down syndrome babies include a small, round head, wide eye spacing, narrow eye fissures, slanted outer corners of the eyes, epicanthal folds, low nasal bridge, small ears, narrow mandible, frequent sticking out of the tongue, excessive saliva. They have delayed physical development, short stature, delayed bone age, slow tooth development, frequent dislocation. Their limbs are short, tendons are loose, and joint curvature is excessive. Fingers are short and thick, almost unable to curve inward. Both motor and sexual development are delayed.