He's refused everything I've given him today, breast milk, formula, lunch, water. Everything. I'm worried he's not going to get enough calories in him or he's going to get dehydrated. Should I just go with it as he's doing what is instinctively right for him or should I try something else? He's had three bouts of diarrhoea today, not spectacular, but he's not himself, really grizzly and hacked off.