I was asking because Katherine 5mo weight 3,8lbs and eats a ton lol she dont look to skinny but could be mistaken as a cat not being feed witch she eats allot i have a dewormer coming in the mail to try that i just hope she fills out her sis gigi weighs 4.8lbsIn general, for kittens up to somewhere around 6-8 months, it's usually about a pound per month. So an 8 -9 week old usually weighs about 2 pounds. and a 5 month old kitten usually weighs around 5 pounds.
Of course there is some variation. this is just average. and in general females are usually a bit smaller than males.