My cat is separating a kitten with a bad leg. Is she rejecting it?

This is a very concerning finding, if the mother is actively taking the kitten away from the others she may feel this kitten is unwell and may be putting the other kittens at risk. I wold recommend a vet check for the kitten and mother to rule out any signs of infection and it may be worthwhile trying to bottle feed the kitten if rejected by the mother but success rate is quite poor if the kitten is unwell

It is possible that the momma cat thinks there is something wrong with this kitten, that it doesn't smell right, or that she isn't a great momma cat. I would continue to watch and see if she will claim the kitten within 24 hours. If not, you may have to take away the kitten and bottle raise it. If you do, I would have the kitten examined by a vet for any possible congenital abnormalities that the momma cat may have picked up on. Here is an article for raising orphan kittens (if you need it!): http://www.veterinarypartner.com/Content.plx?P=A

Consider having it physically examined by your veterinarian. A mother's instinct is strong and the kitten may be sick or injured. If the exam is clear, it may be a case of abandonment and you will need to hand raise the kitten yourself. A kitten milk replacement, such as KMR, can be bottle fed for the next week or so and then you can begin weaning to solid food. This is done my mixing kitten food with KMR to make a gruel slurry. Gradually decrease the amount of liquid over the next several weeks until the kitten is eating canned food by 8-10 weeks of age.

Poor thing. Sometimes mama cats can sense that a kitty has some sort of defect, so they will neglect them and focus on the healthier kitty. Also, if somehow the kitty was touched by a person and the mother no longer smells the kitty's scent, but instead a human, this too will cause the mother to neglect said kitty. Give it time and continue to monitor this kitty closely to see if she is getting fed and stimulated to pee and poop on her own. If she isn't, then it may be a good idea to separate the kitty and nurse her yourself until she can be weaned onto kitty dry food, which is around 3-4 weeks of age.

She may need to eat or use the litter box, causing her to leave them for a bit. She may have been planning on coming back. It could be that Oya is rejecting her kittens, which can happen. Some cats are poor mothers and will reject their kittens, while others will reject a kitten because they know it's sick and not going to make it. It can take time for a mother kitten attend to their kitten, and I would leave her and her kittens alone for 30 minutes in a room. Come back and see if she has groomed them, and/or started to feed them. If she has started bonding with them, then it's fine. If there is no evidence that she has started taking care of them, then you will have to feed them yourself. This requires a kitten formula and bottles. You can get kitten formula from a pet store or a grocery store. I will put a link below on how to care for newborn kittens. Best of luck, I hope this helps! https://www.2ndchance.info/orphankitten.htm

It sounds like Habia is rejecting this newborn. Newborn kittens are extremely fragile, and are very susceptible to hypothermia and hypoglycemia (low blood sugar). You will have to keep him warm and bottle feed him yourself. You need to go to the store to get a kitten formula. I would recommend KMR which you can get from the grocery store. Hand rearing a newborn kitten is very time intensive, so be prepared for that. Check out this website for details on how to hand rear a kitten: http://icatcare.org/advice/hand-rearing-kittens

IT might be a good idea to separate her, keep her a little warmer and this way you can put more attention on her and help her survive these first few weeks of life. if needed feed her with a syringe very carefully.