Mamas with black children, when did you start using oil/leave in conditioners in your baby’s hair ?

Im guessing its when they get out of the phase of having super silky baby hair but I wanted to make sure, I’m having my first baby and I’m not great at hair so I want to make sure I have a good hair routine going for baby girl from the jump so that it’s as healthy as possible thus making it more manageable hopefully, I appreciate any advice ☺️