* Breed: Some breeds are known for having larger litters than others.
* Age of sow: Younger sows tend to have smaller litters.
* Nutrition and health: Well-nourished and healthy sows are more likely to have larger litters.
* Environment: Stressful environments can affect litter size.
It's not uncommon for a sow to have anywhere from 5 to 15 piglets in a litter.