Have you tried the Moo Goo stuff? I've used it on L and it seems to help although I must admit his is only very mild.

Check out their website. I ordered some stuff for D because his skin was SHOCKING as a newborn (not really eczma but sooo many other issues with his skin) and apart from cortisone cream it was the only thing that helped. We've used the udder cream, the eczma cream and I use the milk bath on all the kids. I liked it so much I actually brought the anti ageing cream for myself

Have a look, if you think it might help let me know because I have a sample tub here I can send you