They're almost 5 months old and have rotten colds, coughs, runny noses etc and just won't take any milk for me. I think in the last 48 hours they've had less than 16 oz each, they normally take 4x8oz bottles a day and have always been good eaters...am I right to be worried or will this pass and not harm them? Seeing HV tomorrow morning but I'm just feeling sick - they nust be soooo hungry!