as the history of the church revealed in Acts shows, their central debate was over whether or not the Gentiles had to include their children in the New Covenant by means of circumcision—their debate was not whether the Jewish Christians had to start excluding their children.
Never considered that all the debates surrounding circumcision would also obviously include circumcision of children, but of course they would, it is unlikely that there would have been talk of circumcising only those with a credible profession of faith