Concerning Christ's life the Creed speaks only about the mysteries of the Incarnation (conception and birth) and Paschal mystery (passion, crucifixion, death, burial, descent into hell, resurrection and ascension). It says nothing explicitly about the mysteries of Jesus' hidden or public life, but the articles of faith concerning his Incarnation and Passover do shed light on the whole of his earthly life. "All that Jesus did and taught, from the beginning until the day when he was taken up to heaven", is to be seen in the light of the mysteries of Christmas and Easter.
Source: Catechism of the Catholic Church (Vatican.va)