18 month old son has been unwell for a month with that awful dry cough thing that seems to be going round. Anyway two days ago he started with diarrhoea it's yellowish and like curdled milk. He's vomited a few times but it's the I'm guessing tummy pains that's the worst. He has also got awful smelly burps, is this normal? Or part of a new bug? He's eating bits and drinking a little. You can his tummy grumbling away. He's playful enough in himself tho. Anyone any ideas what it could be?