The term "colt" is not to be confused with foal, which refers to a horse of either sex less than one year of age, or yearling, which refers to a horse of either sex between the ages of one and two.
The term "colt" only describes young male horses and is not to be confused with foal, which is a horse of either sex less than one year of age. Similarly, a yearling is a horse of either sex between the ages of one and two.