Chapter III: Masses With Children in Which Only a Few Adults Participate
20. In addition to the Masses in which children take part with their parents and other family members (which are not always possible everywhere), Masses with children in which only a few adults take part are recommended, especially during the week. From the beginning of the liturgical reform it has been clear to everyone that some adaptations are necessary in these Masses. 
Such adaptations, but only those of a more general kind, will be considered later (nos. 38-54).
21. It is always necessary to keep in mind that these eucharistic celebrations must lead children toward the celebration of Mass with adults, especially in the Masses at which the Christian community must come together on Sundays.  Thus, apart from adaptations that are necessary because of the children's age, the result should not be entirely special rites, markedly different from the Order of Mass celebrated with a congregation.  The purpose of the various elements should always correspond with what is said in the General Instruction of the Roman Missal on individual points, even if at times for pastoral reasons an absolute identity cannot be insisted upon.