This sounds quite serious; I would contact a vet ASAP.
Kittens should stay with their mother until at least 10 weeks, and continue nursing throughout this time. Kittens should usually stay nursing for 12 weeks, but the kittens' mother will normally stop them nursing when the time is right.
The real question is, is the cat yours? Are you close to the cat, and does she trust you. She will NOT kill the kitten, but she may bite or scratch you if sh is not familiar with you. She will allow people she is close to to handle the kittens from the day they are born. Unless you are sure the cat is close to you (emotionally) than the best advice is to give the mama cat and her new babies some space.
It's possible that the cat can miscarry one kitten and still carry the rest full term. If your cat has miscarried one kitten, I advise you to take her to the vet because if a kitten died in her it could make her very ill, or even die, and it can also harm the other kittens.
She will start to swell.
It can be bad because it can swell up in it's stomach.
Infections causes it to swell
maybe a cyst
Tonsillitis
Adema. Very similar to why humans legs swell up during pregnancy. It is nothing to worry about.
asthma
swelled My toe swelled up last night.
It softens and causes the hair to swell
No
MUMPS
No.
water on the knee, torn cartilage, arthritis, these are just a few of the causes.
because you are smiling