A young horse is called a foal, suckling, weanling, colt, filly or yearling, depending on its age and, in some cases, its sex. Foals, sucklings and weanlings are male and female horses younger than one year old.
Yearlings are horses of either sex between the ages of 1 and 2 years. A colt is a male horse younger than 4 years of age, and a filly is the female equivalent. However, in some regions, both male and female young horses are called colts.
A young horse is different from a pony, which is a breed of equine that has a short stature and a stocky body.