When Did Jeremiah Decide to Become a Prophet?

Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations. Jeremiah 1:5

So when did Jeremiah--using his "free will"--decide to become a prophet? I hear it was early in his life. Perhaps right after he reached the age of twelve, the "age of accountability".

No. There were no Baptists then to invent this idiotic idea.

Perhaps it was when he was eight days old and decided to become a member of God's covenant people through circumcision?

No. It turns out he must have decided to become a prophet before God formed him.

I am in no way trying to denigrate Free Will. Not at all. But Jeremiah's "free will" is not a factor here.

Why not? Because he did not exist yet. So it was God's free will that made Jeremiah a prophet. It is as if God is the one who did the choosing and the forming, as it always is.

I know that the great majority of church goers fall on their faces to worship man's free will. It is such a boost to their egos. So they steadfastly follow ignorant or lying preachers, rather than read, at least, the first five verses of the book of Jeremiah. The Bible tells us here, and elsewhere, that God does all the choosing--just as babies do not decide to be born, but they are anyway.

Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. John 1:13