Whether a baptism was valid
Do I need to be baptised again?
In case of necessity, any person can baptize provided that he have the intention of doing that which the Church does and provided that he pours water on the candidate's head while saying: "I baptize you in the name of the Father, and of the Son, and of the Holy Spirit."
The essential rite of the sacrament follows: Baptism properly speaking. It signifies and actually brings about death to sin and entry into the life of the Most Holy Trinity through configuration to the Paschal mystery of Christ. Baptism is performed in the most expressive way by triple immersion in the baptismal water. However, from ancient times it has also been able to be conferred by pouring the water three times over the candidate's head.
In the Latin Church this triple infusion is accompanied by the minister's words: "N., I baptize you in the name of the Father, and of the Son, and of the Holy Spirit." In the Eastern liturgies the catechumen turns toward the East and the priest says: "The servant of God, N., is baptized in the name of the Father, and of the Son, and of the Holy Spirit." At the invocation of each person of the Most Holy Trinity, the priest immerses the candidate in the water and raises him up again.
The ordinary ministers of Baptism are the bishop and priest and, in the Latin Church, also the deacon. Cf. CIC, can. 861 # 1; CCEO — Codex Canonum Ecclesiarum Orientalium (Code of Canons of the Eastern Churches), can. 677 # 1. In case of necessity, any person, even someone not baptized, can baptize, if he has the required intention. the intention required is to will to do what the Church does when she baptizes, and to apply the Trinitarian baptismal formula. the Church finds the reason for this possibility in the universal saving will of God and the necessity of Baptism for salvation. Cf. 1 Tim 2:4.
Baptism constitutes the foundation of communion among all Christians, including those who are not yet in full communion with the Catholic Church: "For men who believe in Christ and have been properly baptized are put in some, though imperfect, communion with the Catholic Church. Justified by faith in Baptism, [they] are incorporated into Christ; they therefore have a right to be called Christians, and with good reason are accepted as brothers by the children of the Catholic Church." UR 3. "Baptism therefore constitutes the sacramental bond of unity existing among all who through it are reborn." UR 22 # 2. An indelible spiritual mark . . .
Incorporated into Christ by Baptism, the person baptized is configured to Christ. Baptism seals the Christian with the indelible spiritual mark (character) of his belonging to Christ. No sin can erase this mark, even if sin prevents Baptism from bearing the fruits of salvation. Cf. Rom 8:29; Council of Trent (1547): DS — Denzinger–Schönmetzer (Enchiridion Symbolorum). Given once for all, Baptism cannot be repeated.
§1. If there is a doubt whether a person has been baptized or whether baptism was conferred validly and the doubt remains after a serious investigation, baptism is to be conferred conditionally.
§2. Those baptized in a non-Catholic ecclesial community must not be baptized conditionally unless, after an examination of the matter and the form of the words used in the conferral of baptism and a consideration of the intention of the baptized adult and the minister of the baptism, a serious reason exists to doubt the validity of the baptism.
§3. If in the cases mentioned in §§1 and 2 the conferral or validity of the baptism remains doubtful, baptism is not to be conferred until after the doctrine of the sacrament of baptism is explained to the person to be baptized, if an adult, and the reasons of the doubtful validity of the baptism are explained to the person or, in the case of an infant, to the parents.