Why did my rabbit's newborn kits die shortly after birth again?

So male rabbits cannot be spayed, they can be castrated. Are you 100% that they are all done, and that you dont have a female who is actually a male? One of these must be the case. You could ask the vet to spay her whilst pregnant, it is more risky though. You could just wait until the rabbits are born and have them euthanized.

It's hard to know why the kits are dying, it could be due to an infectious disease or possibly due to low milk production of the mother. if they seem healthy and are active i would recommend keeping them together with the mother and hopping for the best.

It is quite common for mothers to abandon a baby if there is a significant birth defect that may limit survival. It may b worthwhile attempting to bottle feed but success rate is very poor in rabbits even without additional complications

It is very possible that she is having a false pregnancy as you have already suggested. This process is called psuedocyesis and is very common in rabbits shortly after their pregnancy has completed. Unless you are seeing other signs of illness or she persists with this behavior for several more days, I would not seek veterinary attention at this time. Continue to make sure she is eating and drinking normal amounts and that her bowel movements look an appropriate consistency. There is a drug available to stop false pregnancies, but this is not something I would suggest using at this time. Hope this helps!

If she is acting abnormal then you need to get her to a vet for an exam. If she is acting normal this just could have been a late expulsion of a placenta from the last kit that was born. If she is sick, not eating, lethargic, etc then she needs a vet right away as there may be a dead kit inside her still.

Thanks for reaching out about Donya. Some does might not reach sexual maturity until 6 months of age. But there could also be something wrong with either the male or the female resulting in infertility of either. Just because the male breeds, does not mean he is fertile. Determination at this point would require a veterinary visit and likely diagnostic testing. The palpable masses in the abdomen could be babies but also fecal material. Good luck.

I am happy that you are paying close attention to your rabbit and her babies. It's likely that she is being super clean and actually eating the feces and cleaning away any urine from her nest as soon as its produced to keep her babies clean as well. Make sure she has plenty of food, hay and clean water. Rabbits prefer to raise their kittens without being disturbed so try not to handle her too much.