Babies are born with a corrupt nature ----(Sin Nature )--
I agree that God has given children a graced period of time where He does not impute sin on children as they do not know right from wrong -----good from evil -----and until they understand fully the difference between good and evil they are deemed innocent by God -----and God does not impute sin upon them -----
There is scripture to back this up ------
God's people rebel here
Deuteronomy 1:37-40 ABCE
37
The Lord was angry with me also for your sakes, and said, You also shall not enter Canaan.
38 But Joshua son of Nun, who stands before you, he shall enter there. Encourage him, for he shall cause Israel to inherit it.
39 Moreover,
your little ones whom you said would become a prey, and your children who at this time cannot discern between good and evil, they shall enter Canaan, and to them I will give it and they shall possess it.
40 But as for you, turn and journey into the wilderness by way of the Red Sea.
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this describes Jesus as a boy -----not being able to know right from wrong -----
Isaiah 7 NIV
The Sign of Immanuel
13 Then Isaiah said, “Hear now, you house of David! Is it not enough to try the patience of humans? Will you try the patience of my God also?
14 Therefore the Lord himself will give you[
c] a sign:
The virgin[d] will conceive and give birth to a son, and[e] will call him Immanuel.[f]
15
He will be eating curds and honey when he knows enough to reject the wrong and choose the right,
16 for before the boy knows enough to reject the wrong and choose the right, the land of the two kings you dread will be laid waste.
17 The Lord will bring on you and on your people and on the house of your father a time unlike any since Ephraim broke away from Judah—he will bring the king of Assyria.”