Both my 18 month old twins have been a bit unwell for a week or so (colds with occasional coughing) but yesterday one of them was in a particularly bad way. He was hot in the morning (38.5), gave him 2.5ml ibuprofen, he ate some lunch and drank plenty of water before going down to sleep for 3 hours (90min - 2 hours is usual) and even then I woke him up. At that point he was hot again - didn't feel like he was burning up but thermometer said 41.5!! Gave 5ml of ibuprofen, prepared to dash to hospital, but along with the roads being awful he didn't seem too bad and his temp dropped to 38 in 30 minutes. He was clearly unwell, but drinking well and not floppy, just happy to curl up with me (quite unusual). A couple of hours later he was back terrorising his brother, ate loads of dinner, all turned out well.
But, should I have panicked more? When he was about 9 months old he had a temp of 40 and was still crawling around and eating loads. Does he just work okay at high temps, should I doubt my thermometer (only a year old, digital, gives sensible readings when we are well), or have I been lucky that nothing bad has resulted from these high temps?