The Soleo one says that you can use from newborn. It uses nanofine zinc oxide as the active ingredient, and I think they also use zinc oxide in a lot of nappy rash treatments. I use it myself and it is a really nice cream.

The UV Natural one is very similar, the main difference is that it uses iron oxides as well as zinc oxide, which give a tint to the cream. Iron oxides are said to increase the UV protection (by broadening the spectrum) but I've read conflicting info on this - apparently it will have little to no effect at the proportions that are used in a product like the UV Natural sunscreen. Iron oxides are usually used as colourants in natural cosmetics so it may have just been added to make it look prettier!

I've heard that some people prefer the Soleo because the UV Natural marks light clothing, but don't know whether this is true or not.