My son just spent the day in a&e for dehydration after a bad stomach bug he's had all weekend on friday he was weighed at an appointment he weighed 11.33kg today he is 11kg with ketones in urine. They of course managed to get him to drink luckily and he then produced his 1st wet nappy of the day so we were let home im now desperately trying to keep him drinking. My question is isnt that amount of weight loss concerning in just 3 days ?