How big will that foal be when it's fully grown? Mature size is influenced by nutrition, health history, breed, and the foal's genetics, among other.
How big will that newborn foal be when he's full-grown? While a horse's mature size can be influenced to some extent by nutrition, illness.
Hannah (Quarter Horse mare) and Spirit, her foal. Did you know you can use math to estimate the mature height of a foal? This indicates her approximate mature height at the withers when she’s all grown up.
There is no specific formula for estimating foals' mature size that works in all instances.