Postpartum diarrhea is not necessarily normal for female cats. If it is only mild diarrhea and there are no other symptoms, it may be caused by a stress reaction or licking the kitten's feces. This is normal and can be treated with some probiotics. However, if the female cat’s diarrhea does not improve and is accompanied by vomiting, poor energy, loss of appetite, etc., then it is abnormal. It is most likely that the female cat’s postpartum resistance is reduced, and the diarrhea is caused by a virus or bacteria, and she needs to be treated immediately. Send to pet hospital for examination and treatment.