Q. How much weight should a 5 month and a 1 to 2 year old kittens weigh
A. There isn't a short answer as to the right weight. We would need to factor in size, breed, body build etc. Instead here is a nice diagram that demonstrates the type of characteristics of what a thin/healthy/overweight cat looks like to help determine if your cat is appropriated healthy for their size. Http://burnspet.co.uk/petcare/dog-cat-body-condition-chart.html When in doubt a check up with a vet can help determine if they are on the right track.