Organic cotton yarns for chemical sensitivities

I have a potential customer whose family has chemical sensitivities. She would like me to make her some toys for her children, out of organic cotton, stuffed with organic wool. I was wondering if anyone has any recommendations? Thanks in advance.

Welcome!
There are pages of organic cotton yarn on Ravelry. The reviews are to the right. Perhaps that’ll help?
https://www.ravelry.com/yarns/search#sort=best&query=organic%20cotton

One I would highly recommend is Lion Brand Cotton Ease. It’s a dream to knit with. I used it for making chemo hats for my son in law. It’s light, great for bald heads, and he was able to wear it all night in bed. The price is reasonable.