A study of the reference service to children in the children's department of a large public library and in an integrated public and school library. A Danish investigation by Birgit Wanting has been used as a model for the study. Children's questions have been collected by the staff of the libraries and subjects, expressions and behaviour have been analyzed. The answers and the respons from the librarians are discussed. The results show that there are great differences between school-questions and children's own questions. The  schoolquestions are connected to the curnculum and the library must cooperate with the schools. Children's own questions concern all sorts of subjects and all sorts of material are needed. The children express themselves according to their development and the questions are often vague and undecided. The children's librarians devote a lot of work and time to find out what the children really are asking for. The investigated libraries play a very important role for children's own search for knowledge.