My cat is thin after nursing kittens. How much should I feed her?

It's hard to say if this is medical or behavioral. Some pets are not very food motivated. Definitely watch her weight gain, most kittens will gain about 1 pound per month. Monitor her for any signs of illness such as diarrhea or vomiting. If you have not tried it yet, try to Royal Canin baby cat food. Most kittens seem to like it. When in doubt, have her checked out by a veterinarian. I hope this helps!

It would be the right time to start introducing solid food gradually. Initially just mixing it with kitten milk, then over 4-5 days wean her off onto solids completely. She is too big to rely on milk only.

I would recommend feeding regular adult food and just giving her a bit more than you typically would. She should gain weight pretty quickly if the flea burden is gone. It is a little unusual for a healthy adult to lose weight from fleas, unless her nutrition was also poor or she had a another underlying disease. If she is not gaining weight with the increase in calories you may want to check in with your veterinarian to make sure there isn't something else going on.

You can get her spayed now, that's fine to do. Speak to her vet about feeding her a kitten food to give her extra calories, calcium, and protein to make her gain weight. I would free feed her for now (leave food out all the time) so she can eat when she's hungry.

I would recommend that you start them on a balanced kitten food instead of the a/d. a/d tastes good and is high in fat, but it is not an appropriate diet for long-term use in healthy pets. The amount to feed would depend on the diet you choose - there will always be feeding guidelines on the pet food packaging. You can choose either wet kitten food or dry food, and it may help to mix some of the kitten milk replacer in with either food to make a mush. At such a young age, I would leave plenty of food out and let them free feed, making sure it stays as fresh as possible. If you choose a kitten food and need help determining how much to feed them, take a picture and post a new question!

At 8 weeks your kitten can be on a completely solid diet, and if you're feeding regular cow's milk it could be what is causing the diarrhea (cats can't handle milk.) If she doesn't drink a lot and doesn't like moistened food, you can try adding in a pet fountain or other running water source that may encourage her to play or drink a bit more. If she is still having loose stools even after feeding only her regular food, a vet checkup to rule out parasites and GI upset is also a good idea. If she is trying to nurse your other cat, just separating her for a bit can help deter the behavior.

I would feed her wet/canned kitten food during the last three weeks of pregnancy so she hass enough nutrition for making her babies grow properly. Oncee she has given birth you can keep feeding her the kitten food, so there will be an easy transition when the kittens will start to eat solid food at around 6 weeks. Find homes for them now, but do not give them away before they are 12 weeks old, as they will still need mama to teach them to be good kitties, to hunt, what is safe, what is not, etc. They will also need their siblings to play and play hunt and get coordination.