What happens to all the kids in Limbo?

The meaning of truth is raised somewhat by this effort to change the doctrine of the Catholic Church. There are some things that change as the Lord reveals new truth, and there are cases where the Lord revokes commandments, (such as the Mosaic dietary rules for Christians), but how long has the Catholic Church been telling people that unbaptized infants who die, go to Limbo?

The Mormon Church teaches this quotation from the Book of Mormon:

4 And now, my son, I speak unto you concerning that which grieveth me exceedingly; for it grieveth me that there should disputations rise among you.

5 For, if I have learned the truth, there have been disputations among you concerning the baptism of your little children.

6 And now, my son, I desire that ye should labor diligently, that this gross error should be removed from among you; for, for this intent I have written this epistle.

7 For immediately after I had learned these things of you I inquired of the Lord concerning the matter. And the word of the Lord came to me by the power of the Holy Ghost, saying:

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; wherefore the curse of Adam is taken from them in me, that it hath no power over them; and the circumcisionision• is done away in me.

9 And after this manner did the Holy Ghost manifest the word of God unto me; wherefore, my beloved son, I know that it is solemn mockery• before God, that ye should baptize little children.

10 Behold I say unto you that this thing shall ye teach--—repentance and baptism unto those who are accountable and capable of committing sin; yea, teach parents that they must repent and be baptized, and humble themselves as their little children, and they shall all be saved with their little children.

11 And their little children need no repentance, neither baptism. Behold, baptism is unto repentance to the fulfilling the commandments unto the remission of sins.

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!

13 Wherefore, if little children could not be saved without baptism, these must have gone to an endless hell.

14 Behold I say unto you, that he that supposeth that little children need baptism is in the gall of bitterness and in the bonds of iniquity; for he hath neither faith•, hope, nor charity; wherefore, should he be cut off while in the thought, he must go down to hell.

15 For awful is the wickedness to suppose that God saveth one child because of baptism, and the other must perish because he hath no baptism.

16 Wo be unto them that shall pervert the ways of the Lord after this manner, for they shall perish except they repent. Behold, I speak with boldness, having authority from God; and I fear not what man can do, for perfect love casteth out all fear.

17 And I am filled with charity, which is everlasting love; wherefore, all children are alike unto me; wherefore, I love little children with a perfect love; and they are all alike and partakers of salvation.

18 For I know that God is not a partial God, neither a changeable being; but he is unchangeable• from all• eternity to all eternity.

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.

That doesn't sound good for all those have preached for a thousand years that these children are in Limbo