Texts for children are all kind of texts dedicated to children. There are many sorts of texts that are not included in this clasification as for example works such as comic books, joke books, cartoon books, and nonfiction works that are not intended to be read from front to back, such as dictionaries, encyclopedias, and other reference material. Although there's a particular branch of writing dedicated to children as far as publishers notice that they can sell more books opening this branch, they do it, and books finally end being read by all age public.
Written material by children for children is also considered literature for children, you can read productions as for instance The Young Visiters by Daisy Ashford (aged 9) who can show you a childish point of view in his writting manner.
Consequently, adults select the material for children and they mostly choose the traditional fairy tales, nursery rhymes and other voyages of discovery problematic of life. Adults tent to avoid the situation for children of facing certain things, as matters related to desire, violence and wrong actions performed by human beings.
Summing up it is said that there's no real, authentic and absolute literature for children though it is believed so in order to sell more.