Catholics who have not yet received the sacrament of confirmation are to receive it before being admitted to marriage, if this can be done without grave inconvenience.
Some of the other sections talk about marriage “between two baptized persons”. Seems rather obvious to me that one cannot receive Catholic sacraments unless baptized. For example:
Can. 1068 In danger of death, if other proofs are not available, it suffices, unless there are contrary indications, to have the assertion of the parties, sworn if need be, that they are baptized and free of any impediment.
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