What do Mongols call a little girl?

In Chinese, brothers and sisters born to the same parents are called "brothers, sisters, brothers and sisters" respectively. There are only three words in Mongolian, namely, ah (brother), egch (sister) and duu (brother/sister). "Sister" and "brother" use the same symbol, and there is no sign of gender. In spoken English, the word "daughter/girl" is sometimes added before duu (brother) as a symbol of "female", which is different from that of men. As a result, all relatives, whether blood relatives or in-laws, use duu as long as they are commensurate with their brothers and sisters, regardless of gender. For example, "Cousin" is uyel duu and "Cousin" is bol duu. This shows that Chinese is more cultural than Mongolian.