Q: Hi Father, Is it possible to have a Baptism within a Nuptial Mass?

Context: The father of a couple getting married is seeking Baptism and has inquired if it could occur during the wedding.

Thank you.

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A: The liturgical books never envision this, and I don’t recommend it. You’d have to cobble something together on your own because there’s no official guidance—and I think that’s worth noticing.

Each of these sacraments is worth its own independent celebration.

Furthermore, if the baptism of an adult is taking place apart from the Easter Vigil, the bishop’s permission is required, and preliminary weeks of preparation and relevant rites are to be observed. It’s not as easy as you may think.

Here are some excerpts from the OCIA in the United States. The translation is different from the one currently in force in Australia, but these rules should be the same:

Introduction: 

23: The Sacraments of Initiation of adults (nos. 206-243) should be celebrated during the Easter Vigil itself (cf. nos. 8 and 17). …
26. Although the Order of Initiation should normally be arranged so that the Sacraments are celebrated during the Easter Vigil, it is nonetheless permitted, because of unusual circumstances and pastoral needs, that the rites of Election and of the Period of Purification and Enlightenment be celebrated outside Lent and the Sacraments themselves outside the Easter Vigil or Easter Day. …

29.  The “Election” should be celebrated about six weeks before the Sacraments of Initiation, so that there is enough time for the Scrutinies and Rites of Handing On. 
34. The Bishop can, for his own diocese:…

2) When appropriate, decide whether and when the Order of Initiation can be celebrated at other times (cf. no. 26).

3) Dispense from one Scrutiny in view of serious impediments or even, in exceptional circumstances, from two (cf. no. 331)….