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Hello, this is Dr. JEss. I am sorry to hear about your kitten. If she was only 12 weeks old when you got her, she really should have another round of vaccines. Most veterinarians vaccinate about every 3 weeks until between 16 and 20 weeks of age. So she may need to go to the vet anyway, to get another vaccine.
Does she have any discharge from her eyes or nose? Is she sneezing all day long or just every once in awhile? Is she breathing ok? Energy ok?
Those are all good signs. We become very concerned with lethargy, decreased appetite, or any trouble breathing. If she develops these she needs to be seen immediately. If she develops green or yellow eye or nasal discharge, she may need a course of antibiotics. Most of the causes of upper respiratory infections are viral (like a human getting a cold) and will eventuallly go away with time, but sometimes they can get secondary bacterial infections and antibiotics can shorten the course of the disease. If you have a humidifier you can put it in the room with her overnight, or if you don't you can put her in the bathroom while you take a steamy shower for 10 minutes to provide some humidity which may help loosen any congestion.
Even if she is doing well other than the sneeze, it is a good idea for you to take her to your vet to get established as a patient, that way they can listen to her lungs and be sure they sound clear, and if she needs medication prescribe it, and then they have her on file if she has future problems you can call and they will be more willing to discuss her with you!
Here is an article on upper respiratory infections in cats:
We become very concerned with lethargy, decreased appetite, or any trouble breathing. If she develops these she needs to be seen immediately. If she develops green or yellow eye or nasal discharge, she may need a course of antibiotics. So these are the conditions that definitely require veterinary care.
Please let me know if you have any other questions I did not answer.
If she just continues with the mild sneeze, it may pass on its own in a week or so (like a human cold). If you feel she sounds a little congested, you can also use saline nasal drops to aid in clearing the nostrils.
Just following up to see how your kitten is doing?