Thank you, that is quite reassuring, as neither of them are showing any sign of illness! I think that is why I am so shocked about it all, the only thing has been Fred's cystitis which started today, so has been caught early, but both of them play and tumble about like normal kittens. Even with the cystitis Fred has been playing! he is a bit subdued now, after being prodded and poked at the vets, I did keep asking if it could be that they haven't developed yet and she should not expect them to match other kittens their age developmentally and have normal kidney function as a result, but she did not say and I was so shocked and upset at the vets, expecting some antibiotics and to be told he has kidney failure! then to be told that the test results were not nearly as bad as she expected (she was good though and squeezed us in at 8 just as they were closing and did all the tests then and there without charging emergency consultation fees). I have never seen this vet before, I normally see a different one, I think she is new or a locum.