Avoid creams that contain minerals, they may appear nice and moist to begin with but long term dry the skin more. Sometimes is the chemist brand, no fancy marketing moisturisers that are best. I second oatmeal based stuff. Goat milks soap too.

If we are unable to get our girls skin's dryness under control, we use a hydro cortisone cream for a couple of days, mixed on with the moisturiser, it helps to retain moisture in the skin. If flare-ups occur and don't calm down within a week or so using the hydro cortisone, I use a corticosteriod in the patches. Luckily now we can control it by keeping the skin moisturised, which we actually do twice daily, even if I miss one I can tell the difference the next day. We've had to switch DD2 clothes to all cotton, cause anything synthetic that doesn't breath makes her sweaty and this makes the breakouts worse. At the moment she spends most day in a cloth nappy and thats it.