Are silk slips to help with hair loss safe? Websites such as silky tots say they follow SIDS guidelines https://www.silkytots.com/pages/faqs

Red Nose has no specific recommendations about silk sheets for baby.
However, it is important that baby’s head & face remain uncovered, so any bedding that is likely to become loose & cover baby’s head & face should be avoided.
Heavy or excessive bedding should be avoided to reduce the risk of overheating.

https://rednose.org.au/article/sleep-baby-with-head-and-face-uncovered
https://rednose.org.au/article/safe-bedding-is-the-bedding-safe
https://rednose.org.au/article/bedding-amount-recommended-for-safe-sleep