"For the Good of the Whole"
Baptism is the first of the three Sacraments of Initiation. In Baptism, the 'one Spirit' makes us members of the Body of Christ and of 'one another' [CCC #1267]. Every person helps make the whole of the 'one Body of Christ'.
For children, we are asked to take these Vows [Sacred Promises] for our children, as our children need formation and guidance.