The Catechism of the Summa - Tertia Pars - XXV. OF THE SACRAMENT OF BAPTISM: OF ITS NATURE; OF THE MINISTER OF THIS SACRAMENT (B)

(B)
Who can administer the sacrament of Baptism?

It can be administered validly by every human being having the use of reason and performing the rite correctly with the intention of doing what the Church intends when the Church administers it (LXVII.).

For Baptism to be administered licitlv what is required on the part of the person who administers it?

The person who administers Baptism must be in the conditions determined by the Catholic Church (LXVII.).

What are these conditions?

For Baptism to be administered licitly in the case when ordinary conditions are absent (in which ordinary conditions the priest himself administers it in conformity with the rules laid down by canon law and the ritual), or when in extraordinary circumstances it is administered by a deacon, there must be an urgent necessity for the administering thereof, that is there must be danger of death; and in such case anyone can licitly administer Baptism whether he be priest, or cleric, or layman, man or woman, or child who has attained the use of reason, or even a person who is himself not baptized, provided the correct rite be used and the person have the proper intention: always the order among the persons above mentioned should be followed, and it is only in the case of the absence of the preceding person that the following one may baptize (LXVII. 1-5).

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