Thanks for the advice everyone.

Its not a bad rash, just a bit of redness around his bum which clears after a night in a sposie and sudocreme. Im not sure what our nappies are made of but we mainly use the baby beehinds multifits. We also use a flushable liner which is a bambino mio brand one. Again not sure of what it is made of.

Might need to get my hands on some moo goo. Iv never seen it in the sops though, any idea where i can locate some?