"157. Q. How many kinds of Baptism are there? A. There are three kinds of Baptism: Baptism of water, of desire, and of blood.
The Catechism must not be misunderstood as hereby meaning that of these three one is as good as the other to the soul. It means that in certain circuмstances the baptisms of desire and of blood cause in the soul the chief effects for which the Sacrament of Baptism was instituted, viz.: the infusion of sanctifying grace. On account of this effect they have been called Baptism, although the name, in its exact meaning, does not apply to them. There is only one Sacrament of Baptism, and that is the baptism of water; baptism of desire and baptism of blood do not contain what constitutes the essence of a Sacrament." - CATHOLIC THEOLOGY or THE CATECHISM EXPLAINED, by Rev D. I. Lanslots, O.S.B.