Generally speaking, "nursery rhymes" refer to songs sung by children, which have no music score and harmonious and short syllables. It has many names. For example, Du Fu, a person from the dynasty, classified "nursery rhymes, female rhymes, nursery rhymes and baby rhymes" as "nursery rhymes" in "Common Proverbs". Besides, there are other ancient books called Songs of the Wise Son, Children's Songs, Children's Songs, Confucian Songs, Children's Tales and Girls' Ballads. Although the names are different, the contents are the same.
All countries and nations in the world have nursery rhymes, and even nations without words have nursery rhymes. Traditional children's songs belong to a kind of folk literature and should be included in folk songs. There are basically no clear categories and boundaries of nursery rhymes, and all ballads suitable for children to listen to and sing can be classified as nursery rhymes.