Here are some things to keep in mind:
* Breed: Different horse breeds have different average sizes. Some breeds, like miniature horses, will be significantly smaller than others, like Clydesdales.
* Individual Variation: Even within the same breed, there is variation in size. Some foals might be a little taller or shorter than average.
* Measurement: Height is typically measured from the ground to the highest point of the horse's withers (the area between the shoulder blades).