I think this is probably reasonably normal, but it's never happened with DD, so I wanted to ask...
DS is 2.10 and generally a fairly well behaved, slightly bonkers little boy. But when he's sick, not even very sick, even just a cold, he turns into a complete monster. He's got a cold right now, nothing serious or sinister, but for the last 3 days he's not listening to anyone (tells me his "listening ears are boken"), spitting, calling me names he knows aren't allowed (poo head, etc), lashing out, etc. I was talking to his nursery teacher about it and we've figured out that it's when he's sick (he's had a bad run of minor ailments/viruses in the last few months) he behaviour turns for the worse. He will wake up in a couple of days and his normal personality will return like a switch has been flipped. I don't want to be too hard on him when he's under the weather so we're going for ignoring bad, praising good behaviour, but is this type of change normal?