The local ordinary little black cat (it should be just full moon visually), take good care of it. I think it's because the mother cat put it in front of your shop on purpose. Usually, when stray cats can't find enough food, they will reluctantly send their kittens to the front of the house that they think is safe and can help them. Black cats are town houses, evil spirits and auspicious things. A black cat is very similar to Meng Maimao, and its body is painted black.
You can buy some pacifiers for cats in pet shops, feed them with cat milk powder if possible, or feed them with fish juice cooked by omnivores if not (that is, chop the cooked fish into paste). To keep the cat warm during this time, it is best to make a cat nest out of cardboard boxes.