Upper Respiratory Infection (URI) is a common illness in orphaned kittens, mainly because they did not receive the all-important colostrum they needed from mother-cat. Also, depending on how long they were exposed to the elements, they could have become chilled and now their nose may be plugged up, or you will see tell-tale bubbles coming from their nostrils and they could be in some distress. A blocked nose means the kitten can’t smell their food and if they can’t smell, they may not eat. Kittens with URI need vet intervention and the proper medication to help them over it. URI’s are very contagious so expect if one kitten has it, the rest will soon follow suit.
You can take the kitten into the bathroom with you, place him in a secure location and turn on the hot water until steam fills the room to help break up the mucous in his nose and lungs. You can also use saline drops in the kitten’s nose to clear it, but first check with your vet and do not use any human medications on kittens. Adding one drop of Grapefruit Seed Extract to their formula will help as well.