Newborn kittens should not drink soy milk. Newborn kittens need to be fed their mother's milk and cannot digest other foods, so soy milk should not be given to them. They should be given kitten milk. If kitten milk is unavailable, pet-specific goat milk can be used as a substitute. Cat owners can use a 10ml syringe (without the needle) or a small bottle to feed the kittens. 
How to feed newborn kittens:
1. Food: Primarily feed with goat milk powder, 5-6 times a day. Establish a feeding schedule based on the cat's and owner's time, or feed the kitten whenever it's hungry. One-month-old kittens can only eat liquid food. Purchase specialized pet goat milk powder for feeding. Kittens are lactose intolerant and cannot drink cow's milk. If goat milk powder is unavailable, rice water or thin millet porridge can be used as a substitute, but cow's milk should be avoided. Kittens should be fed small, frequent meals, 5-6 times a day, or the feeding time can be determined based on the owner's schedule.
2. Feeding amount: Start by feeding the kitten 4ml of goat milk. If it smacks its lips after drinking, gradually increase the amount. After one day of testing, you can fix the feeding amount according to the kitten's size. Kittens are small and eat little at each meal. Initially, prepare 4ml of milk powder and feed it to the kitten. If it still smacks its lips after finishing, it means it is not full, so increase the feeding amount until the kitten is full and falls asleep. Generally, one day of testing will allow you to know the kitten's appetite. Prepare an appropriate amount of milk powder each time, and discard any unfinished milk powder; do not save it for the next meal.
3. Feeding Supplies: Kittens can be fed using a 10ml syringe (without the needle) or a small baby bottle. When purchasing kitten goat milk powder, you can first inquire whether it comes with matching feeding supplies, such as a small syringe or a small baby bottle, what temperature it can withstand, and how to use it. After preparing the goat milk, let it stand to cool down. Once the temperature reaches the temperature of the back of your hand, you can feed it to the kitten.