Children

Matthew 19:14–15
“Jesus said, Suffer little children, and forbid them not, to come unto me: for of such is the kingdom of heaven.
“And he laid his hands on them, and departed thence.”

Psalm 127:3
 3 Lo, ^achildren are an ^bheritage of the Lord: and the fruit of the womb is his ^creward.

Elder Robert D Hales, General Conference: Strengthening Faith and Testimony, General Conference October 2013
"Children and youth love to be included. We make a serious mistake if we assume that the conference is above their intellect and spiritual sensitivity. "

Moroni 8:19-23
19 Little children cannot repent; wherefore, it is awful wickedness to deny the pure mercies of God unto them, for they are all alive in him because of his mercy.
20 And he that saith that little children need baptism denieth the mercies of Christ, and setteth at naught the atonement of him and the power of his redemption.
21 Wo unto such, for they are in danger of death, hell, and an endless torment. I speak it boldly; God hath commanded me. Listen unto them and give heed, or they stand against you at the judgment-seat of Christ.
22 For behold that all little children are alive in Christ, and also all they that are without the law. For the power of redemption cometh on all them that have no law; wherefore, he that is not condemned, or he that is under no condemnation, cannot repent; and unto such baptism availeth nothing—
23 But it is mockery before God, denying the mercies of Christ, and the power of his Holy Spirit, and putting trust in dead works.

Doctrine and Covenants 29:46-47
46 But behold, I say unto you, that little children are redeemed from the foundation of the world through mine Only Begotten;
47 Wherefore, they cannot sin, for power is not given unto Satan to tempt little children, until they begin to become accountable before me;