Roman Catechism 16.134

Chapter 16 — Part II: The Sacraments — Baptism

Section 134. The Sign Of The Cross — Next his forehead, eyes, breast, shoulders and ears are signed with the sign of the cross, to declare, that by the mystery of Baptism, the senses of the person baptised are opened and strengthened, to enable him to receive God, and to understand and observe His Commandments.