Today’s confession points to the frequency of the sacrament of baptism.
It is analogous to OT sacrament of circumcision which is administered once.
Baptism is administered once. As long as it is administerd correctly as we have looked at from earlier confessions: with water, in the name of Father, Son, and Holy Spirit and performed with a minister of the gospel, it is to be recognized as a valid baptism.
Because it only needs to be administered once, baptism is recognized among different Christian denominations and churches. So if you were baptized in the Baptist church, going to a Presbyterian church would not invalidate your original baptism.
Historical precedence includes John Calvin who even after the reformation, considered his baptism in the Roman Catholic church a valid baptism and did not get “re-baptized.”
This also applies to infant baptisms. Even as the child grows into a fuller understanding of the gospel, the child does not need another baptism. Rather, the baptism is God’s promise to that child and to her parents of God’s saving grace.
Let’s read this confession together.
7. The sacrament of baptism is to be administered only once to any person.