All children are born into this world by natural birth and are by nature sinful after the nature of Adam. they become spiritual by being born again, same as adults, as described in Eph 2, with the exception of some that are born again spiritually while still in their mothers womb as John the Baptist was.
Let me put it to you how God told me.
"Except a
MAN be born again, he cannot enter into the kingdom of heaven".
And then He said emphatically, "
BABIES are NOT, MEN!!!"
God already took me down this road, and I don't need a second tongue lashing to get the revelation all over again. I got it the first time.
You now have two witnesses, stating, children go to heaven when they die at a young age.
Romans chapter 7:9 and the above verse.
Look up the definitions to the original language. Children are not held accountable for their actions until they are of age.
They have to first die spiritually like Adam did, and that doesn't happen when they are conceived, but when they come to adulthood.
As for the exact age of when that is, I don't know. I think it varies per person.
When the children of Israel sinned against God, and He made them wander in the wilderness, whose carcasses fell in the desert, both the children and the adults, or just the adults of 20 and up?
What was the age for a man to go to war?
Exo 30:12 When thou takest the sum of the children of Israel after their number, then shall they give every man a ransom for his soul unto the LORD, when thou numberest them; that there be no plague among them, when thou numberest them.
Exo 30:13 This they shall give, every one that passeth among them that are numbered, half a shekel after the shekel of the sanctuary: (a shekel is twenty gerahs
an half shekel shall be the offering of the LORD.
Exo 30:14 Every one that passeth among them that are numbered, from
twenty years old and above, shall give an offering unto the LORD.
Num 1:3 From
twenty years old and upward, all that are able to go forth to war in Israel: thou and Aaron shall number them by their armies.