The priest dips his thumb in Cathecumenorum oil and greases the new-born's breast and moving the hand as for cross says: "Ego te linio oleo salutis in Christo Jesu Domino nostro, ut habeas vitam aeternam. Amen." Then the priest pours holy water over the new-born's head and moving the hand as for cross, with emphasis says: "Ego te baptizo in nomine Patris et Filii et Spiritus Sancti." At least the priest says: "Vade in pace, et Dominus siti tecum. Amen."
From "Rituale Romanum" priest's manual edition 1847: baptism formula.