A foal is a young horse of either gender. More specific terms are colt for a male foal and filly for a female foal. When foals reach breeding age (typically age 2-4), the terms change: a filly is called a mare and a colt is called a stallion. A castrated male horse is called a gelding. (There is no specific term for a spayed female horse, but this is rarely done to horses.)

Healthy foals grow fast and can put on three pounds or over a kilo a day. A sound diet improves growth and leads to a healthier adult animal, although genetics also plays a part. In the first weeks of life the foal gets everything it needs from the mare’s milk. Like a human infant, it receives nourishment and antibodies from colostrum in the milk. The mare needs plenty of water to help her produce milk for the foal and may benefit from a supplementary feed.

A foal may start to eat solids from ten days of age, after eight to ten weeks it will need more nutrition than the mare's milk can supply; supplementary feeding is required by then. Foals develop rapidly; normally a foal will stand up and nurse within the first hour after it is born, and most can gallop by the next day. A newborn foal's legs are almost as long (90%) as those of an adult horse. (Wikipedia)

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