After a gestation period of sixty-three to sixty-eight days, the female cat gives birth to a litter of one to ten kittens weighing 70 to 150 g each. The average birth weight is 100 g and varies according to a number of factors, including:- Sex: Females are slightly lighter than males; Breed: Newborns of large breeds like the Norwegian Forest Cat are heavier than those of other breeds;- Litter's size: In litters of over five kittens, newborns are lighter.- Mother's diet during gestation: If the mother's diet is unbalanced or insufficient, the fetuses can suffer from malnutrition, and she may produce lighter, weaker kittens that may even have birth defects.
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