If baptism is the replacement for circumcision, then it should occur after birth - spiritual birth.
You will note circumcision wasn’t meant to make someone a Jew. I was circumcised, but that didn’t make me a Jew. You can baptize an infant, but it won’t make him a believer.
Converts to Judaism were baptized and circumcised - in recognition of their conversion. Not to create a conversion.
I’m just interesting in the timing of both events.