I use either Gaia, or Alchemy wash stuff - although I used mostly warm water only for about the first six months, and only used a cleanser if he was really filthy. It's better for the skin as it disrupts the natural oil balance less, and means that you won't have to use moisturiser. I personally am of the school of thought that advocates least intervention when it comes to baby's skin - if you use only warm water to wash with, you are less likely to require anything else.

I use moo-goo as well as a general bum moisturiser - the skin milk. A lot of people swear by the MSM cream for nappy rash, which has been developed for people with eczema and dermatitis and contains organic sulphur. My DS reacts to either the sulphur or to the synthetic fragrance used in the MSM cream so we can't use it (to the best of my knowledge it is the only moo-goo product to use a synthetic fragrance, it has been specifically chosen as a low allergenic fragrance for sensitive skin - essential oils can be irritating to extremely sensitive or damaged skin).

Moo-goo is not actually a barrier cream though, it is absorbed, but many people find it just as effective because it helps to prevent nappy rash.

For actual barrier creams: Paw paw salve (the Simmons or black packaged Lucas brands are petrochemical free, the red Lucas salve has a petrochemical base) works well, as does generic zinc & castor oil cream from the chemist. Zinc is a highly effective barrier, but if you prefer something that is not mineral based, lanolin is also very effective. Sunspirit do an excellent lanolin based calendula salve (calendula is excellent for nappy rash), or you can use generic anhydrous lanolin from the chemist (which is what Lanisoh is, but about a 1/4 of the price).

It's recommended not to use powders on newborns, the particles can be inhaled and irritate the lungs. Some people find that they contribute to nappy rash by caking on the skin, although others find them effective for nappy rash. Additionally, the mineral talc has been linked to cervical cancers in women, so if you do want to use a powder, it's best to use a cornstarch based powder. I make my own (for myself) by combining seven parts organic cornflour to one part china clay with a small amount of essential oils. You can do the same for a child's powder, using only cornstarch, and fragrance with a drop or two of chamomile oil.

HTH!