Thanks Fletch. IKWYM about trying natural remedies first. I wash DS clothes, then give them 3 rinses of plain water. I dont put any soaps in his bath water, I have changed nappies to the Ecobots, and am now using chux wipes/water instead of baby wipes, as he has very sensitive skin. I have stopped giving him tuna, and when two weeks are up, and if he still gets it, I will stop the weet bix for a few weeks to see if it is that.
I dont know about you, but it drives me batty! I think the worst part is not knowing what it really is, or what is causing it. Keep in touch and let me know how you get on.