Weanling is a term used to describe an animal that has just weaned. It is most commonly used to describe a type of young horse, a foal that has been weaned, usually between 6-12 months old. However, the term can be used for any animal that has just been weaned. In horses, weaning is usually done when the foal is about 6 months old. It is also important to remember that weaning may occur at different times for different foals. Once a foal is one year old, the horse is referred to as a yearling.