[tcbasche]

It seems like your mind is already made up, but in any case:

https://rednose.org.au/article/Co-sleeping_with_your_baby (Australian non-profit raising awareness against SIDS)

https://raisingchildren.net.au/newborns/sleep/where-your-bab... (Australian government-based parenting resources)

https://www.nhs.uk/conditions/baby/caring-for-a-newborn/redu... (UK Health service)

It's all official health advice from government bodies which say it's unsafe regardless of the parents situation.

I've found though this debate is similar to the "anti-vax" one, in that most people are quite emotional about it regardless of evidence, and can't generally be persuaded.