Check out the curve on the WHO growth charts - by the time they hit 9-10 months old it is getting pretty flat (i.e. weight gain starts to become static). Perfectly normal for an active bub. :)
you've pretty much answered your own question - he's very mobile at the moment and a bit off his food, but otherwise happy and growing.
I rest my case! ;)
When DS was 6 months he weighed about 7.3kg. I weighed him on our scale today (of course it only has the lines) and he weighed around 8 maybe a little over. I'm use to seeing the weight in lbs where we can see a real change. But I'm wondering if I should be concerned.
He's formula fed and he eats the puree solids. Not too much with the solids lately since his teeth have really been pushing threw and he's been gagging on the food. He has gotten a lot taller as he's almost outgrown most 9 month clothes and he still looks chubby. DS is also very mobile as he's trying to walk.