My baby is nearly 5 months old and has become attached to one of my shirts. She enjoys holding the shirt and this will often soothe her to sleep. I'd like to know if it would be safe for her to have this in her cot with her if I made it much smaller, and if so, what size does it need to be. Alternatively, are there any materials which I could try to give her to replace the shirt such as a thin, breathable muslin? Thanks, Carly

Red Nose does not recommend the use of soft toys or comforters for babies less than 7 months of age, as there is a risk of baby’s head and face being covered which may cause suffocation

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