Although these verses speak of the Exodus and Pharaoh, it shows that God has the ultimate say in his sovereignty.
Romans 9:15-16 For he says to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion. So then it is not of him that wills, nor of him that runs, but of God that shows mercy.
Personally I believe that all children are taken to heaven, but in reality, it is God’s mercy that allows anyone to enter into his presence. Thus, who are we to speak for Him in such authority?
A problem I see with using Psalm 51 to send infants to eternal destruction or to simply vanish, is that it directly links with 2 Samuel 12 where David looses his child as a result of his own sin of having sex with Bathsheba and then having her husband (who was a righteous man) murdered to cover up the fact that he had gotten her pregnant. Anyone who has lost a child knows the grief of loosing a child. It is something that just isn’t natural. In an emotional state, it would be natural to see all the sin that surrounds oneself as grief engulfed ones very soul. David made a big mistake, one that he was facing the reality of. Thus, to say that psalm 51:5 Look, I was guilty of sin from birth, a sinner the moment my mother conceived me; is to show ones inner turmoil as he confronts his sin to YHWH in this confessional.
In Psalm 139, David also rights; Psalm 139:14-16 I will give thanks unto thee; for I am fearfully and wonderfully made: Wonderful are thy works; And that my soul knoweth right well. My frame was not hidden from thee, When I was made in secret, And curiously wrought in the lowest parts of the earth. Thine eyes did see mine unformed substance; And in thy book they were all written, Even the days that were ordained for me, When as yet there was none of them.
So here we have David’s name written in the book (of life?) ;Before he was born? To this, I liken to Malachi 1:2-3 I have loved you, saith Yahweh. Yet ye say, Wherein hast thou loved us? Was not Esau Jacob's brother, saith Yahweh: yet I loved Jacob; but Esau I hated, and made his mountains a desolation, and gave his heritage to the jackals of the wilderness. Which co-insides with Romans 9:13.
So it seems to me that children are not born inheriting the sin of Adam (Galatians 6:5
For every man shall bear his own burden ., Ezekiel 18:19-20
19 Yet say ye, Why? doth not the son bear the iniquity of the father ? When the son hath done that which is lawful and right, and hath kept all my statutes, and hath done them, he shall surely live.
20 The soul that sinneth, it shall die. The son shall not bear the iniquity of the father , neither shall the father bear the iniquity of the son : the righteousness of the righteous shall be upon him, and the wickedness of the wicked shall be upon him.
KJV) and if they are, one can omit Psalm 51 as a resource to show otherwise.
Furthermore, there are many, many other verses that I could post on children and how precious they were to Jesus. Surely Yahweh would not have an infant just to fill a slot in hell. On the note of the child simply ceasing to exist (annalisism), I could almost see that if I believe in it. But I don’t so that only leave one option for me and that simply put is this. God will have mercy on whom he chooses to have mercy on. It is my prayer that every child that dies, will be in heaven.
God Bless you all in Christ.