Moroni 8

Mormon wrote Moroni -

"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—"  (Book of Mormon | Moroni 8:22)

In modern day we learn -

"...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..."  (Doctrine and Covenants | Section 29:46 - 47)

What great blessing of comfort for parents that lost young ones.