The pure heart of a child allows them to see angels. When have been harden so much by life, that we have protected ourselves so much that we can no longer see the angel who is right besides us. the angel at rice ave.
Catholic teaching - "I baptize you in the name of the Father, the son and the Holy Spirit." The water is an essential part of the experience. Between each part of the Trinity, the infant has water poured on or is submerged in water.