Stop bathing daily! Once or twice a week is fine for babies, bathing is very irritant. Top and tail daily with ORGANIC products and organic creams.
The reason I say organic, is you will know that they do not contain irritant chemicals such as Methel/Ethel Parabens, harsh perfumes etc. "Little Me" Organic range has been great for my DS4.
May brands with "Natural" in big letters on the packaging are choc full of nasty stuff - Jonstons products are hideous for sensitive babies. "natural" on a label means nothing, legally, but "organic" does, and it's a lot easier to buy organic than read through the long ingredient lists on these products looking for the chemicals you want to avoid!
Swap to Non -Bio washing powder, and STOP using fabric conditioner! It makes your clothes soft by leaving a layer of synthetic chemicals on the clothes.
Baby wipes, don't use on the face or trunk (skin tends to be much more sensitive than bottom, or hands, feet). Only use unscented ones. Tesco sensitive are inexpensive and really good, read the labels- many wipes are full of Parabens, including "Tesco value wipes"
Steroids are great when needed, but often changing the above things will avoid (or reduce) the need to use them.