DS2 will need 5 months old on Tuesday. He's always been a really great eater on a brilliant 3.5-4 hour schedule of 6 oz of milk, taking about 30-32oz a day. Yesterday he started refusing bottles we've not when he was showing signs of hunger and only ended up eating 17oz all day - even going to bed without having his last feed. He did finish a full bottle at 3am but won't take his first feed of the day again. I essentially had to dream feed him every single bottle he had yesterday and even that didn't work sometimes. He's been using variflow teats so I don't think it's that. He does sound a little congested (I have a scratchy throat like cold) so maybe he's got that too and that's why he doesn't want to eat. He seems completely himself though. Still getting wet and dirty nappies. Really what I'm asking is when should I worry?