Compare these words of Mormon:
8 Listen to the words of Christ, your Redeemer, your Lord and your God. Behold, I came into the world not to call the righteous but sinners to repentance; the whole need no physician, but they that are sick; wherefore, little children are whole, for they are not capable of committing sin; ... 12 But little children are alive in Christ, even from the foundation of the world; if not so, God is a partial God, and also a changeable God, and a respecter to persons; for how many little children have died without baptism! (Mormon 8)...to this verse from the Book of Moses:
54 Hence came the saying abroad among the people, that the Son of God hath atoned for original guilt, wherein the sins of the parents cannot be answered upon the heads of the children, for they are whole from the foundation of the world. (Moses 6)Compare also:
46 But behold, I say unto you, that little children are redeemed from the foundation of the world through mine Only Begotten; (Doctrine and Covenants 29)
Hat tip: Noel Reynolds.