Middle of the night poos

Ok, so this is weird but for the last 4 days I think DS has been waking in the night probably around 3 or 4 and the reason is he has done an enormous poo, its not overly upset or diahorrea like but its not quite right iykwim.

If he doesn't wake at night, he's been by the time we get him out of bed.

He is going more often in the day, again its a bit loose but i've seen way worse and he's happy as.

Anything I can do - is it just a mild bug?????????????????? Or has he decided the best time to go is at night?

Nope not toilet training.

No real change in diet, I do think he is teething 2 year old molars and he's had a nasty cold and been run down for a while, no real change in diet and he normally only goes once or twice a day and currently its more like 5/6 times, its only been the last 4 days or so just since the weekend really.