Do you have any information on the safety of weighted sleep sacks for babies?

Red Nose has the following information in relation to weighted blankets & weighted sleeping bags.
https://rednose.org.au/news/weighted-baby-sleep-sack-warning-from-red-nose-in-lead-up-to-red-nose-day-on-friday-12-august

https://rednose.org.au/article/weighted-blankets

Weighted bedding is not recommended for babies, especially less than 12 months of age.
The weights in the blanket or sleeping bag may cause pressure on chest, causing respiratory difficulties.
Let me know if you have any specific questions about weighted bedding.