Hello Thank you for using our service. If it’s a sneeze, not a cough, there’s something in the environment that stimulates his respiratory system rather than a certain disease suspected by sneezing itself. I don’t know exactly what your environment is like, but they often sneeze due to dust from sand used in cat litter boxes, or allergic to pollen. Therefore, please change the sand for cats into a product with less dust, or use it by filtering it outside.
I hope you are satisfied with the above answer. Thank you.

hasn’t had any vaccinations yet . She’s still playful but I can tell she’s sick. Eating and going to the bathroom fine

Kitten has been sneezing and sounds congested