I've described below what's happened to 2 of my 4 Birman kittens in the past few weeks. If anyone has guesses what could be going on, I'd appreciate any feedback. I haven't been able to google anything that matches these symptoms, together or separate.
First, we found one of the male kittens not moving one evening. He completely refused to even stand, the most he'd do was sit. I had to even lift him into the litterbox and then out again. The cat's stay indoors, we don't know if he fell somewhere or not. When touching, nothing felt broken and the kitten only showed pain when touching the hip/upper hindleg area. A few days after, he also developed an eye infection. It took him about 4-5 to start wobbling along again, but he was otherwise very energetic and even tried to play with front paws when he didn't want to move otherwise. Next, about a week later (on Mothers Day, of course...) another male kitten was literally screaming in pain and came out from the litterbox and collapsed on the floor. I imagined it had to do with stomach issues, and took him to the vet the same day. He was given laxative oil that day + pain meds, but he didn't improve much by evening so he got antibiotics (the vet thought that the likely reasons were either constipation or urinary tract infection, or he'd swallowed something dangerous). 1h after giving the antibiotics he indeed peed and felt better. He also ate (very little, but still), but I had to feed him chicken broth for 2 days as he refused to drink. 5 days he didn't move an inch, sat up at the most. Few days later he started to take interest in his brothers and sisters and to eat and drink normally, 5 days later he started to walk again. Both of them still limp, and it looks like they limp at least 2 of their feet.
Neither one has had any respiratory issues (no coughing, runny noses, sneezing or anything), the gums, tongue etc are ok and Cat Flu tests came back negative. They're still both on antibiotics.
Any similar experiences?