I've had many cats but for whatever reason probably because I gravitate towards the runts they've all been very petite and only around 3.2kg when fully grown.
We have two kittens at the moment that have been with us since birth as we fostered their pregnant mother cat.
The girl was the runt and is 2.12kg at 18 weeks. I expect she'll stay quite small as she has very petite features.
The boy, Luke Skywhiskers, though.....what a monster!
He has been weighed at the vets this morning as 3.4kg at 18 weeks old!
Any guesses as to how big he might end up? What does your biggest cat weigh?