Let's look at Psalm 58:3 carefully before we jump to any conclusions:
The wicked are estranged from the womb: they go astray as soon as they be born, speaking lies.
1. This verse is specifically about "the wicked", NOT all human beings (who are simply lost sinners).
2. God has perfect foreknowledge of the wicked at the time that they are born. He knows that they will not ever repent and be converted. Hence they will remain estranged from God from the womb.
3. God also knows that they will begin to go astray and do wickedness from a very early age, and there will be no redemption for them.
4. This entire Psalm is about the wicked. The Psalmist even desires God's judgment to come upon these wicked persons -- Let them melt away as waters which run continually: when he bendeth his bow to shoot his arrows, let them be as cut in pieces.
Now, no one can take this Psalm and apply it right across the board. There are some (many) who were wicked and repented of their wickedness. Let's take the case of Jonah and Nineveh:
THEIR WICKEDNESS DECLARED
Arise, go to Nineveh, that great city, and cry against it; for their wickedness is come up before me. (Jonah 1:2)
THEIR WICKEDNESS REPENTED OF
But let man and beast be covered with sackcloth, and cry mightily unto God: yea, let them turn every one from his evil way, and from the violence that is in their hands.
Who can tell if God will turn and repent, and turn away from his fierce anger, that we perish not? And God saw their works, that they turned from their evil way; and God repented of the evil, that he had said that he would do unto them; and he did it not. (Jonah 3:8-10)
Now the question arises: "Can babies and young children understand the Gospel and know what it means to repent and believe on the Lord Jesus Christ?" And the answer is obvious.
Therefore God -- who desires the salvation of all mankind -- has made full provision for the salvation of those who cannot respond to, or obey, the Gospel. And that is through the shed blood of Christ and His sacrifice for the sins of the whole world. And God even makes this clear in the book of Jonah: And should not I spare Nineveh, that great city, wherein are more than sixscore thousand persons that cannot discern between their right hand and their left hand; and also much cattle? (Jonah 4:11). How much is sixscore thousand ? 1 score = 20 x 6 = 120 x 1000 = 120,000.
This is a reference to babies and very young children, who did not understand the difference between "left" and "right". They did not put on sackcloth, and had no clue about repentance, but GOD SAVED THEM BY HIS GRACE.