The celebration of baptism must be prepared properly; consequently: 1/ an adult who intends to receive baptism is to be admitted to the catechumenate and is to be led insofar as possible through the various stages to sacramental initiation, according to the order of initiation adapted by the conference of bishops and the special norms issued by it; 2/ the parents of an infant to be baptized and those who are to undertake the function of sponsor are to be instructed properly on the meaning of this sacrament and the obligations attached to it. The pastor personally or through others is to take care that the parents are properly instructed through both pastoral advice and common prayer, bringing several families together and, where possible, visiting them.
Source: Code of Canon Law (Vatican.va)