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Consult with local veterinarians and shelters to find out if there is a nursing mother cat who may be able to take on the kitten. Mother's milk is best for any baby mammal, and prior to attempting to bottle feed a kitten with supplemental formulas, it is recommended to seek out nursing cat that could take the place of the absent or unable mother. Be aware that even if you find a cat able to nurse the young kitten, she may not accept the kitten. Always remain present when the nursing cat interacts with your kitten; there is a risk that a queen might attempt to murder a kitten that she rejects. If you are lucky enough to find a foster mother, attempt to disguise the smell of the new kitten. Try stroking the foster mother's own kittens and then stroke your own kitten. This will help transfer the smell of the mother's own litter to your newborn kitten. A queen (the cat) is more likely to reject the kitten if it smells totally unfamiliar, so by "disguising" your kitten's scent, you're increasing the chance the queen will accept her. A newborn kitten can only digest milk, and more specifically the milk from a female cat. Feeding the wrong sort of milk, such as cow's milk, can have short-term and long-term effects, including diarrhea, dehydration, nutritional deficiencies and long-term health problems due to poor growth. You can purchase kitten milk replacement formula (KMR) at your local pet food store, vet's office, and even online. Reputable brands in the United States include Cimicat and Just Born kitten milk, but you can also consult your local vet for advice on a formula that he or she recommends and that is available where you live. Kitten milk replacement milk comes in a tub or drum and is a dry powder or liquid. You use it in much the same way you use infant formula, in that you follow the directions on the packaging which guides you as to how many scoops to use to how much water. Be aware that milk sold in cartons as "cat milk" is NOT suitable. This is cow's milk with the lactose removed and is designed to make bovine milk accessible to adult cats (to fulfill our need to feed them milk, rather than any physiological need of the cats themselves.) It is not suitable for use in kittens. The ideal milk is to use replacement queen's milk. If you do not have any, then use boiled water to feed the kitten and purchase some replacement milk immediately. If the kitten seems very hungry, then you can add one teaspoon of glucose powder to one cup of boiled water. However, you should only do for one feeding. Do not repeat. Another alternative as a stop gap until you can get some replacement milk is to use rice water, meaning the water that you cook rice in. Cook some white rice in water and strain off the liquid. This has a little starch (energy) in it and is non-laxative, and can be a temporary solution. Giving water in the interim will stop the kitten getting dehydrated, and is a better compromise than feeding something (like cow's milk) which could upset her tummy and make her ill. Remember that the younger the kitten, the higher the kitten's metabolism and the more often she needs to be fed (due to her tiny stomach). This means that you, or someone else in your household or a friend or neighbor, needs to be around all day until the kitten is old enough to begin switching over to solids. A newborn kitten, technically a kitten under two weeks of age, needs feeding attention day and night until she is old enough to begin the process of switching to solids. Weaning means to get the kitten off milk and introduce solids slowly. You can do this once the kitten reaches four weeks of age, when your kitten is no longer a newborn. You can tell when your kitten is no longer a newborn and is ready to be weaned and be fed solids when she starts biting at the nipple of the bottle. To wean your kitten from milk, place a small amount of food in her dish. If she doesn't seem ready or willing to eat it, you can add a few tablespoons of milk replacement formula or water to soften the food and encourage her interest. Make sure to always have solid food out so that your kitten can approach it when she feels ready and wants to. Over time, reduce the amount of milk you offer as you increase the amount of solids. Most kittens can handle a diet of solids by seven weeks of age. A kitten aged between six to 10 weeks old needs to be fed six to eight meals a day, while a kitten aged 10 weeks to six or seven months needs four meals a day and a kitten up to nine months needs three meals a day. Note that it's not until adulthood that two meals a day for a cat is acceptable.

Summary:
Try to find a nursing mother feline (queen). Get milk. Have a backup plan if you can't have replacement milk right away. Plan your time. Know that you can wean an orphan kitten early.