Children's poems are usually short, generally requiring less than 4 lines. This is because children's language ability and memory have not been fully developed, and long poems may be difficult to attract their attention or remember. Moreover, the purpose of children's poetry is to enlighten children's sense of language, cultivate children's emotions, and meet children's needs for language expression through short and rhythmic poems.
In addition, the content and form of children's poetry should be simple, vivid and easy to understand, suitable for children's cognitive level and aesthetic habits.