Kitten age?

I picked up my newest kitten Jessie on the 6th of June and was told she was 10 weeks old. I weighed her when I got her home and she was 770g. She's been steadily putting on weight and when I weighed her on the 29th of August she was 1964g. She's still really small and I'm starting to think she's a lot younger than we were led to believe. She's just started to lose her baby canines. If she was 10 weeks when we picked her up she would be nearly 6 months old now and this just doesn't seem right. She's a lot smaller than our other kitten Luna who is about 6 and a half months old.

Is it likely that she's actually between 4 and 5 months old?

Here she is curled up on my lap with my hand for size reference.

Oh, and here is a picture of her the day she came home. Does she look 10 weeks old?

With that weight she could hardly be 10 weeks, unless a verry petite, practically dwarf / minicat..  sooner 6, 8 at most.

My guess is she was 6-8 weeks, not more.

Good luck!