Muslin is a type of woven cotton fabric. It has a lighter and looser weave than other fabrics like cotton. It usually has a lower thread count overall. Muslin is a more lightweight and breathable cotton. It is grown with less water than traditional cotton and without any chemical fertilizers, herbicides  and pesticides. Extremely soft to touch, it is the perfect material for swaddling babies. It is also used as a play mat or as a protection measure while out in the sun.

How to do a good job with swaddling your baby?

https://www.youtube.com/watch?v=goHIOS6ALvY

More on muslin...

https://www.youtube.com/watch?v=g4rZFpViV-c