A child with Down syndrome is called a Down’s child, mainly because of chromosomal abnormalities, so it is also called trisomy 21. In children with Down’s syndrome, the hands and feet are mainly characterized by stubby fingers, especially the middle knuckle of the little finger is hypoplastic, the little finger is curved inward, and through the palm lines and straw shoe feet can be seen. In half of the children with Down’s syndrome, bowed skin lines can be seen in the thumb area. The most typical symptom of Down’s syndrome is a peculiar facial appearance, which is characterized by a widened eye distance, a low nasal root, and small eyelid fissures. Low intelligence is also present.