As with all liturgical celebration, it is about how is best for the faithful to encounter Christ in and through the liturgy, under words, gestures and actions. Of course, liturgy by its very nature exerts its own inherent power, instructing and forming the encounter with God.
However, the liturgy must be suitable and approachable to facilitate this encounter. Therefore, it must be suited to the children’s age and capability. Adaptability is therefore important to consider. Catechesis, or explaining the mysteries that occur during the celebration of Mass, is important. This helps children to participate in an active and conscious manner. Therefore, every effort should be made to increase this participation.
This may include having the children prepare the place and altar, sing as cantor, sing in a choir, play musical instruments, proclaim the reading, recite the bidding prayers, or bring the gifts to the altar. This will allow children to tangibly connect with the celebration of the liturgy.
Likewise, the choice of language and vocabulary should be considered, for example the liturgy, and especially the homily, so children may understand. Further resources include the Directory for Masses with Children, published by the Congregation for Divine Worship, and Eucharistic Prayers for Masses with Children.