@mardbein Hi there! So, I can tell you that statistically the most dangerous time for SIDS is considered 2-4 months. To be clear tho, I am not a sleep specialist or a sleep doctor, I am a doula and a childbirth educator so while I spend a lot of my time reading and learning about many many topics, nothing is a replacement for your pediatricians advice that is tailored to your baby. With that disclaimer, the windows I have seen across many, many studies, generally works out to a pattern of wake every 2 hours for 0-2 months, every 3 hours from 2-4 months, and every 4 hours from 4-6 months for the tightest of margins. So, my suggestion is to take this framework and talk to your pediatrician and make adjustments based on their recommendations for your baby, your baby's feeding habits and natural wake cycles, and your baby's health status.
Always contact your pediatrician before making big changes to sleeping habits, feeding habits, etc and discuss what is appropriate for your baby.
If baby doesn't wake themselves, they should be awoken, according to the general consensus of scientific studies, because babies from 0-6 months especially are not built with enough stomach volume to go much outside the framework above. There will be variation, but biologically babies are meant to eat around the clock. Also, that deep sleep pattern that may be contributory to SIDS risk is thought to be a similar pathway that suppresses the hunger cue from waking the baby - it isn't necessarily that the baby isn't hungry, it could be that their hunger cue is not strong enough to overcome the deep sleep pattern to rouse themselves.
I hope this helps, please don't hesitate to ask further questions!
Wishing you the best.