Hi Marin, welcome to TCS.
I'm hoping that perhaps this kitten is at least 6 weeks old, to take a four-week-old kitten away from his mother is very cruel.
The first thing that you need to do is confine the kitten to either a small room or a large box. 4 weeks is too young to be wandering around the house. Prepare some rice socks (http://www.kitten-rescue.com/cold_kitten.html
) and let him snuggle with those. Find a small clock that ticks and bury that in the bedding - this will remind the kitten of his mother's heartbeat and will comfort him.
You'll then need to make sure he isn't dehydrated.
There are two ways to check for dehydration:
Pinch test - Gently pull the skin up on the back of the kitten's neck and release. If the kitten is well hydrated, the skin will snap back into position in a second. If the kitten is dehydrated, there will be a 'tent' in the skin that takes longer to go back into place.
Gum test - With clean hands, lift the kitten's lip and gently press on the gum and release. The gum should turn white for a second and then return to a nice pink colour. If the gum stays pale or is greyish, the kitten is dehydrated.
I would advise feeding Pedialyte diluted 1/2 and 1/2 with boiled, cooled water. Use a dropper or syringe (without the needle of course) and feed him 2ml every hour for 3-4 hours. Make sure it is warmed a little.
1 cup water (boiled then cooled)
Small pinch of baking soda
Small pinch of Salt
2 teaspoons of sugar
Mix all ingredients well. Make sure the mixture has been slightly warmed before feeding to your kitten. The mixture will keep in the refrigerator for up to 3 days. Feed 1ml (1cc) every half an hour for the first two hours using a dropper or feeding syringe. Also make sure your kitten is on his tummy and not his back when you feed. Feed very slowly so the fluid does not go down the wrong tube and choke your kitten.
Never feed a kitten cow's milk or human baby formula as this causes stomach upset and severe diarrhea.
Then you can begin to feed either KMR or kitten glop, as others have said. If he can lap, let him lap this from a tiny bowl or jar lid. If he cannot lap, use the syringe or, ideally, a kitten nursing bottle, to feed him.
Home-made kitten formula (Kitten Glop)
8 ounces water (boiled then cooled)
1 envelope Knox unflavored gelatin
8 ounces whole evaporated milk (not skim)
2 tablespoons mayonnaise (not low fat)
2 tablespoons plain yogurt (not low fat)
1 large or 2 small eggs yolks (raw)
1 teaspoon clear Karo syrup
* 1-3 drops liquid pet vitamins
* 1 capsule acidophilus
* 1 drop Grapefruit Seed Extract (GSE)
* Optional, though very beneficial.
Boil the water, add the gelatin and mix well. Add the following ingredients in order, mixing well after each addition:
1/2 of the canned milk
Mayonnaise and Yogurt
Rest of the milk
All other ingredients
You can substitute canned goat's milk for the canned evaporated milk, if you prefer it. This mixture will keep in the fridge for up to four days. It is jello-like in consistency in the fridge so you can just scoop out as much as you need and warm. It can also be frozen in ice cube trays and defrosted as needed. You can find pet vitamins at a pet store or your vet, and acidophilus and GSE in the liquid form at a good health food store.
Good luck with this little one. I hope he makes it.