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Hello, I'm Dr. Deb and will do my best to help you today.
Congratulations on the new members to your family:) Kittens at this age are an awful lot of fun, aren't they:)
The average respiratory rate of adult cats is between 20-30 breaths per minute at rest. Kittens tend to run a little higher so Chester's brother's rate sounds normal.
Chester's rate sounds a little elevated if it truly is 46 or higher. Make sure you're counting when he's asleep and when he's not purring or after he was just playing. If you're checking at other times, it may be higher than "at rest".
I assume his physical exam was normal on Saturday and that your vet didn't detect any abnormalities; however, if his rate continues to be this high, then I might suggest an x-ray to evaluate his heart and lungs.
The fact that he's otherwise playing and active and behaving as a normal kitten should indicates that there's probably nothing seriously wrong with him but I would want to double check if he were my patient just to be safe.
I hope this helps. Deb
I'm just following up on Chester. How is he doing? Deb