What is young Arabian horse called?

A young Arabian horse is typically called a foal until it is weaned, usually around four to six months old.

After weaning, it's typically referred to as a yearling until it reaches its first birthday.

After that, it's considered a two-year-old, three-year-old, and so on, until it reaches adulthood at around four or five years old.

While there are no specific terms for a young Arabian horse other than these general terms, you might hear people use terms like colt for a young male horse or filly for a young female horse.