These kittens are not flat chested. It is surely nocoincidence that I have two swimmer kittens from different litters with the same father. I have had over the years more than 50 litters and have never seen this syndrome before. Only the hind legs are affected. Is it genetic or an intrauterine infection ? I have found no definite veterinary expanation.
There was nothig in that link you gave me that is relevant. It seems that no one really knows about swimmer kittens. The good news is that the older kitten, 5 weeks is walking almost normally, and the younger definitely improving. Glad they were no euthanized as my vet advised! Neither will be used for breeding in case of a genetic defect. Thank you.
Fearn is almost normal now. Gairloch still has problems on a slippery floor but is managing quite well on a rough surface. But I still have not found out the cause!