Does anyone have any advice about treating mouth ulcers? My 18 month old has not eaten and has been really grumpy for 2 days. I realised today that she has terrible ulcers across one side of her tongue. Any advice? Is it thrush? I'm very worried as I have thrush at the moment (sorry TMI!) and I shared a bath with her 2 nights ago which coincides with her mouth ulcers. Please help!