Hmm I don't have any advice as I'm new to this mummy thing, but just wanted to say that if she's feeding well and having lots of wet nappies, there's not a lot more you can do is there?? Does your doctor know about her current weight? What does he/she recommend? If not, maybe ask them... all the best anyway, hope she beefs up for you soon. I'd love to share some of DS's weight gain with her - I've been told he's gaining too much (almost 100g a day recently!)