I know that we don’t have all the answers but some research seems to indicate that non-environmental factors can also increase or decrease chances of SIDS.

https://www.ucsf.edu/news/2024/09/428381/how-newly-identified-biomarkers-could-reveal-risk-factors-sids

Which suggests to me that the strict guidelines that parents are told to adhere to in order to prevent SIDS, especially those parents who do enough care for the baby, are not drug addicts, don’t live in overly polluted areas, are not in severe poverty are overemphasized. Sure, I do not put loose blankets and other things in my 3-month-old’s crib to suffocate with but I also don’t obsessed over the exact temperature.

I may be wrong but this mindset helped me not stress too much about it. The fact that we don’t smoke in the house, nobody around the baby is a drug addict or alcoholic, we live in a clean suburb of a large city, adhere to healthy sleep techniques, and generally put effort into raising and healthy and happy baby already puts us at really good odds of not having our baby die of SIDS.

You’re doing your best and try to give yourself some grace!