We had ours on Saturday (I'm pregnant and son is 18 months) and he was absolutely fine, he didn't even cry when he had it, just looked a bit annoyed with the nurse (but she did ask if she could have one of the rasins we'd taken to pacify him so it may have been that that annoyed him lol), and the way he was charging around afterwards I don't think he could possibly have felt any worse the wear for it! I developed the sore arm after about 4 hours, which kept me awake for 2 nights, and has only this morning gone really - there's no way lo had it though, he's been far too carefree! The only difference I can think is that my arm was perhaps more tense when the injection went in as I was expecting it, whereas ds wasn't - and that he had a smaller dose.
