Yearling
Definition: A horse or pony of either sex that is under one year of age.
Pronunciation: y eer ling
Examples: Although a two-year-old is ready to start learning to carry a rider, a yearling is not strong enough.
Pronunciation: y eer ling
Examples: Although a two-year-old is ready to start learning to carry a rider, a yearling is not strong enough.
Source...