Just throwing an idea out which occured to me yesterday - could be talking nonsense but bear with me.
My 2 boys (2 and 7 mths) have always had lovely bottoms and been lucky enough to not have suffered from nappy rash or soreness, even when teething or left too long in a nappy. My Mom is often commenting on this, and I've always thought it maybe a combination of cloth nappies (both wear Fuzzi Bunz 90% of the time), breastfeeding in the first months and good diet - although when not being too smug I accept it's probably just down to luck!
However, following a conversation with some other Moms, they were saying their babies often had sore areas, and they thought it might be due to the wipes they use leaving their bums too wet. One said drying babies' bum helped clear it up.
I have only ever used Huggies on my boys (as I like the idea of no lotion on the face/hands), and these seem dryer than most brands, and I wonder if this might be the reason for the beautiful bots (and not me being smug supermom after all!).
Might be nothing to do with it, but I'm feeling evangelical and want to spread the news!