Kitten colds aren't uncommon. Shelters do their very best but it's stressful and add on spay surgery and kittens can get sick.
For the next couple of weeks we are fostering a couple of girls for the shelter as they get over colds. They are sisters and about 3 months old.
Keep in mind that the shelter names the kittens we get so mom is taking no responsibility for naming a tabby kitten Stripes. Haha