Anne, what is his nappy output? Is he dehydrated?

my hubbie and sister have been changing his nappies so I'm not exactly
sure, but it's getting changed around 8 times per day and when I quiz them
they seem to be wet and dirty, so unlikely that this is the problem. I'm
in the UK, we had a heat wave recently, but in the last week it has cooled
down temps around 25 degrees C, I drink plenty so its dehydration is
unlikely.