My son was born to a Jewish mother before I converted. After I converted and became Frum, I made a Pidyon for him. I’m told now that I wasn’t supposed to do it. What do we do now? He is already well past Bar Mitzvah.
Your son should do a Pidyon Haben, but without a Bracha. Sources: שו״ע יו״ד שה, יח. והנה כשאין האב נמצא, ראה רמ״א שה, י ע"פ ריב"ש סימן קלא.…



