In the boys' bath we use oatmeal and calendula petals in a muslin bag - soothing, moisturising and natural (and cheap!). You can just use oatmeal by itself, just in a bag or stocking. Sorbolene is still mineral oil based (unless you get a vegetable oil one) and whilst it may be okay for some, it may trigger a reaction in others, plus it can sting on really dry skin.