as well as 100% cotton. Babies are especially hard to treat, and seem to be ultra sensitive once it starts. Using only sensitive skin products and cotton was what finally offered my little guy relief. This included soap, shampoo, wipes, laundry detergent, NO softener or dryer sheet, and cotton clothing, bedding etc.
Be cautious when introducing new foods. Our ped. rec. waiting as long as possible. My ds is now 11 his sensitivity is much less now.
I hope your little one finds some relief. Poor baby.