cat weight question

My cat is around 10 months old by everyone's best guess. I have always heard that they were supposed gain about a pound a month but I'm not sure how long that rule lasts, lol. She weighs 8.2 lbs according to my bathroom scale. Everyone always tells me she looks thin but I think she's just got long legs. She's a little lanky looking, but she is by no means thin. She's got free choice food but is very active when she's not napping haha! Anyway, I was just wondering if that sounds about right. She's a DSH, no clue on her background, she was found under a porch. Her brothers were bigger than her when I got her, and one was a long hair.... Other than that I don't know anything.

My Sylvie is now 2 yrs and finally filling out ... at 7 months he weighed 9 lbs

If she's eating, drinking and playing I don't think you have any reason to worry. Cats come in all different sizes - my Holland is an adult and weighs all of 6 pounds.

Another one who doesn't think you should worry. Your baby is still a kitten and could continue to fill out and bulk up for another 6-8 months.

I wouldn't worry unless you are feeling/ seeing bones pushing against the skin, or if you notice the kitty is lethargic. Here's a trick a vet tech told me to gauge their weight in relation to their body size. Stand directly over your standing kitty, so that you are looking down on their back. they should have a nice even shape all the way down from shoulders to hips, with only a little sucking in at the gut. Parallel lines are what you want. Like this:

.^^
(....)
|...|
|...|
|...|
\\.../
..\\
...\\_

If their tummy sucks in, like this then they are under weight.

.^^
(....)
|...|
|...|
.).(
\\.../
..\\
...\\_


On the other hand, a kitty with more than just a little outward curve is probably overweight:

..^^
..(....)
..|...|
./.....\\
(.......)
.\\...../
...\\./
....\\_

Not the greatest images, but I hope they help.