Couple of questions regardin my Maine Coon

Hi everybody,

I bought a Maine Coon female 3 weeks ago and I have couple of questions. When I brought her home 3 weeks ago, she was 5 months old and weighted 2.7 kg (6 pounds), now she is almost 6 months old and her weight increased only to 3 kg (6.7 pounds). Is she is not too light for her age? Is everything is normal with her size and weight at this age, as the breeder said she will be around 6-8 kg (13.5 - 18 pounds) at full grown.
Another thing, I have the pedigree certificate and as I can see, her mothers father and fathers father is the same cat and inbreeding perscentage for 4 levels is 10.5%. Is it ok with this or is it too high?
Thank for your answers.

Your little girl will grow in bursts, and you might find that she has slowed down, then will have a massive growth spurt as the weather gets warmer. She has put on half a pound in three weeks, which isn't bad, just make sure she has enough to eat and she will be fine. She will certainly let you know if she is hungry. Make sure she is wormed, as that can affect weight gain, and your vet will be able to supply worming tablets.

With regard to inbreeding, some breeders do mate close relatives occasionally. Feral cats will mate indiscriminately - they don't think about whether they are related beforehand. Providing there are no other instances of such close relatives on the pedigree, and the parents and grand parents are healthy cats, mating a half brother to a half sister is acceptable and you shouldn't have any problems, but you could ask your vet for advice if you are uncertain. Did your breeder have any tests carried out for genetic defects? If you are uncertain, ask for some information, your breeder should be happy to help.