* Individual Variation: Just like humans, horses have different body types and structures. Some mares may have naturally more pendulous teats than others, regardless of how many foals they've had.
* Age: While age can play a role, it's not the sole factor. Older mares might have more saggy teats, but younger mares can also have them depending on their individual anatomy.
* Lactation and Milk Production: Frequent nursing and milk production can contribute to stretching of the teat ligaments, which may result in a more relaxed appearance. However, this is not always the case.
* Breed: Certain horse breeds might be predisposed to having more pendulous teats.
In summary: There's no definitive answer. While having foals can contribute to some changes in the teats, the degree of "hanging" will depend on a combination of factors.