I was wondering safety of weighted blankets for toddlers. I am aware that weight blankets are not recommended for babies but is it safe for toddlers to use from 3 or 4 years of age?

There is very little research about the safe use of weighted blankets for babies & children.
Red Nose recommends the use of light weight bedding.
Red Nose has the following information about the use of weighted blankets:
https://rednose.org.au/article/weighted-blankets