My wife and I watched the episode Genesis a few nights ago. In the episode, Picard and Data discovered that Spot's newborn kittens had not eaten in a day, due to Spot's devolution. Picard and Data understandably had many things on their mind and positronic net at the time, respectively. However, as animal lovers, we were surprised at their rather apathetic attitude towards helpless animals in distress. Even with so much attention being placed on Data's cat for the majority of the episode, there is no end resolution concerning the kittens.
There are few sources which mention the kittens outside of their involvement in the cure to the virus, and as far as I can tell, they aren't referenced again in the few remaining episodes of the series. Are there any canonical or non-canonical sources that give an explanation of their fate? Did they survive long enough for Spot to nurse them back to health after her re-evolution?