My son had his 8 week immunisations last Tuesday and he seemed fine in himself afterwards other than a slight temperature which was manageable with Calpol. Fast forward a week, the last couple of days he has been suffering with really runny nappies. I know that diarrhea can be a common side effect of this vaccine however, I'm just curious whether any of your babies experienced such a delayed response? I expected this to maybe happen a day or two after the vaccine, not a week. He is absolutely fine in himself other than that apart from maybe a bit more sleepy.