The Bible's "sacramental theology" states that there is such a need since "...through one man sin entered the world, and death through sin, and so death spread to all men." (Romans 5:12) For this reason, "...there are none righteous, not even one" (i.e. not infants). (Romans 3:10) How are these young ones saved from the sin they have received from Adam's race? They are saved through the regenerative power of baptism and the faith of the Church (i.e. the Christian faithful): "He saved us, not on the basis of deeds which we have done in righteousness, but according to His mercy, by the washing of regeneration (baptism) and renewing by the Holy Spirit." (Titus 3:5)
"Repent, and let each of you be baptized in the name of Jesus Christ for the forgiveness of your sins." (Acts 2:38)
"Jesus answered, 'Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter into the Kingdom of God.'" (John 3:5)
"...when the patience of God kept waiting in the days of Noah, during the construction of the ark, in which a few, that is, eight persons, were brought safely through the water, and corresponding to that, baptism now saves you." (1 Peter 3:20, 21)