Hi, I was just after some clarification around what age is safe for using the breathable square comforters and exactly which ones are safe?

Red Nose recommends that baby sleeps with head & face uncovered at all times.

Red Nose has the following information about comforters & other soft toys.

Keep soft toys out of the sleeping environment for babies under seven months of age because they may cover the nose and mouth and interfere with breathing.
The risk posed by suffocation by the presence of soft objects in the baby’s sleeping environment outweighs any benefit to the baby from a soft toy. It is therefore advised not to place soft toys and other soft objects in the cot for babies under seven months of age.
https://rednose.org.au/article/soft-toys-in-the-cot