Depends, I have no idea when the "cut-off" should be.
I wasn’t asking for an age cut off and depends is not really an answer. Are you making the case that no distinction should be made for children regarding a cognitive ability to understand the gospel? That a 4 year old, a 9 year old, 12 year old, and a 17 year old should all be treated the same without distinction and forced into baptism by their parents and the church without needing to make a confession of faith?
Please see Genesis 17. Remember, that Ishmael (from whom the promise would not come), is circumcised at
13 years of age after Abraham learns that the covenant will be with
Isaac. He's not an infant, and there's no profession of faith required.
15 And God said to Abraham, “As for Sarai your wife, you shall not call her name Sarai, but Sarah shall be her name. 16 I will bless her, and moreover, I will give you a son by her. I will bless her, and she shall become nations; kings of peoples shall come from her.” 17 Then Abraham fell on his face and laughed and said to himself, “Shall a child be born to a man who is a hundred years old? Shall Sarah, who is ninety years old, bear a child?” 18 And Abraham said to God, “Oh that Ishmael might live before you!” 19 God said, “
No, but Sarah your wife shall bear you a son, and you shall call his name Isaac. I will establish my covenant with him as an everlasting covenant for his offspring after him. 20As for Ishmael, I have heard you; behold, I have blessed him and will make him fruitful and multiply him greatly. He shall father twelve princes, and I will make him into a great nation. 21
But I will establish my covenant with Isaac, whom Sarah shall bear to you at this time next year.”
22 When he had finished talking with him, God went up from Abraham. 23 Then Abraham took Ishmael his son and all those born in his house or bought with his money, every male among the men of Abraham’s house, and he circumcised the flesh of their foreskins that very day, as God had said to him. 24 Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin. 25
And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin. 26
That very day Abraham and his son Ishmael were circumcised. 27
And all the men of his house, those born in the house and those bought with money from a foreigner, were circumcised with him.