3.5 year old has had diarrhoea since Thursday. No other symptoms other than a sudden tummy ache, then diarrhoea and the tummy ache stops. Eating which I am keeping bland - toast, banana, eggs… not sure what else I can give him as this is getting boring! Drinking water, passing urine and playing as usual. It’s been 6 days now and no sign of letting up. Any advice?