My tiny little cat Tiggy has been spayed today at the age of approx 5 1/2 months. She was a rescue kitten so we were'nt exactly sure of her age but I don't think she had come into season yet (going by the information gained on this forum). The vet checked her first and suspected that she may have been pregnant already which was rather surprising as she hasn't been out of the house, our two others are neutered and the dog certainly wouldn't have allowed an extra cat in!!. However even if there had been any doubt that she may have been expecting I would still have gone ahead with the op (rightly or wrongly) because I would have been frightened to death for her - She's so very small and just a baby still herself. By the way for a cat that's just had an op she's exteremely lively, I just had to stop her going up the curtains!!!