Thanks for all the replies, I suppose I am worrying unduly and too early, she's only two weeks old but it just feels a lot longer and I should be more positive.
Like someone said, she was a good weight at birth so the loss of weight isn't life threatening and she is keeping food down and not continuing to lose, so thats a good thing. I just can't get my head around the fact that someone can take in food and not have it show in any way? having said that, she always seems satisfied after a feed so it must be doing something.
Anyway, I have made it up with my daughter, not flying off the handle will be key to maintaining that and I must remember she is anxious too and I won't help by adding to her stress.
Baby looks absolutely fine, see thats the thing, in every respect she looks and acts just like a new born baby should not a sign of anything untoward or anything to indicate any problems, just this failure to put on weight is confusing and exasperating.
They will be going to the children's unit today as arranged so at least they're on top of it, hopefully things will begin to improve from now on. I was told it can take up to two weeks for some babies to stabilise and start putting weight on in a reguarl pattern, so lets hope it's all good from here on in.
Thanks again for the replies, I will keep you informed of any developments.