Good question. I was a sponsor for two people last year who were already baptized. However, there were others who were not and they waited until Easter Vigil Mass to be baptized.
I thought the delay was unnecessary and dangerous since regeneration does begin at baptism.
Baptismal regeneration is the offiical Roman Catholic belief. But when you study the conversions found in the book of Acts, the pattern is quite different. Here is the bibilical testimony: The Apostle will proclaim the gospel of Jesus Christ to a crowd or individual. God the Holy Spirit quickens the elect to be able to spirituality hear the gospel, receive it, and believe the great good news of God for reconcilation to God, peace with God, adoption and becomes a child of God prior to partaking in water baptism. Thereafter, the converts immediately are baptized with water after convresion. Have you ever struggled with Acts 13:48 in regards to who are able to believe the gospel for conversion?
Acts 13:46-50
46 And Paul and Barnabas spoke out boldly, saying, “It was necessary that the word of God be spoken first to you. Since you thrust it aside and judge yourselves unworthy of eternal life, behold, we are turning to the Gentiles. 47 For so the Lord has commanded us, saying,
“‘I have made you a light for the Gentiles,
that you may bring salvation to the ends of the earth.’”
48
And when the Gentiles heard this, they began rejoicing and glorifying the word of the Lord, and as many as were appointed to eternal life believed. 49 And the word of the Lord was spreading throughout the whole region. 50 But the Jews incited the devout women of high standing and the leading men of the city, stirred up persecution against Paul and Barnabas, and drove them out of their district.
Please notice that in the 13 Epistles of the Apostle Paul, water bapitsm in not even part of the gospel proclamation.
T
he Message of Salvation to All - Rom 10
For Moses writes about the righteousness that is based on the law, that the person who does the commandments shall live by them. But the righteousness based on faith says, “Do not say in your heart, ‘Who will ascend into heaven?’” (that is, to bring Christ down) or “‘Who will descend into the abyss?’” (that is, to bring Christ up from the dead). But what does it say? “The word is near you, in your mouth and in your heart” (that is, the word of faith that we proclaim); because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. For with the heart one believes and is justified, and with the mouth one confesses and is saved. For the Scripture says, “Everyone who believes in him will not be put to shame.” For there is no distinction between Jew and Greek; for the same Lord is Lord of all, bestowing his riches on all who call on him. For “everyone who calls on the name of the Lord will be saved.”
How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching? And how are they to preach unless they are sent? As it is written, “How beautiful are the feet of those who preach the good news!” But they have not all obeyed the gospel. For Isaiah says, “Lord, who has believed what he has heard from us?” So faith comes from hearing, and hearing through the word of Christ.