Ratty has been attending nursery for the past 6 weeks now. During this time, apart from the obligatory runny nose, has had a few bouts of diarrhoea and vomiting. This has really set her back, which is rather disconcerting, considering she doesn't have a big build to start with. Her weight has fallen from the 25th to under the 9th centile....mummy is getting worried! EAT!