Here are some factors that can influence a kitten's weight at birth:
* Breed: Certain breeds, like Persians and Maine Coons, tend to be larger and heavier than others.
* Litter size: Kittens born in larger litters may be smaller than those born in smaller litters.
* Mother's health: A healthy mother cat is more likely to produce larger, healthier kittens.
* Nutrition: The mother cat's diet can influence the size and weight of her kittens.
If you are concerned about the weight of a newborn kitten, it's always best to consult with a veterinarian.