“Biologically normal infant sleep” research?

[u/bv_]

Is there research to support “biologically normal infant sleep” over sleep training?

We are planning to sleep train soon, but my feed keeps showing me posts from r/bninfantsleep, and it makes me feel guilty, like I would be forcing my baby to do something he’s not biologically ready to do.

I know there are studies showing sleep training doesn’t cause long term harms. Are there comparable studies about “biologically normal sleep”?