My ds2 was sick saturday night and then again Sunday pm (All down me and on my best bra!!!). He's since had very fluid nappies and I've just changed him again and it is completely liquid. He's mainly been having crackers, bread and water although he did have some milk first thing this morning because he hadn't had a runny nappy for 16/17 hours.
How long should I let it go on before doing anything about it.