Joseph Smith declared that the mother who laid down her little child, being deprived of the privilege, the joy, and the satisfaction of bringing it up to manhood or womanhood in this world, would, after the resurrection, have all the joy, satisfaction and pleasure, and even more than it would have been possible to have had in mortality, in seeing her child grow to the full measure of the stature of its spirit...when the mother is deprived of the pleasure and joy of rearing her babe to manhood or to womanhood in this life, through the hand of death, that privilege will be renewed to her hereafter, and she will enjoy it to a fuller fruition than it would be possible for her to do here. When she does it there, it will be with the certain knowledge that the results will be without failure; whereas here, the results are unknown until after we have passed the test.
-Joseph F. Smith, Gospel Doctrine, p.453