Horses typically have only one foal per pregnancy, but they can have multiple pregnancies (about 1 per year... they are pregnant for 11 months). There have been cases where horses have had twins but the foals usually do not survive because they are underdeveloped. Twins may also be detrimental to the dam.
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Two to three.
I belive that unicorns CAN have babies. I really think they are connected to horses, and horses have babies.
Normally just one.
Thousands of people raise horses, having their own mares and raising the babies.
It depends when your horses are having babies
They are like humans, they have babies when ever.
Horses, babies or adults, have 205 bones in their bodies.
horses can have babies whenever they go into labor, but it isn't always during the day or night
Upto 200 babies at a time according to this, http://www.scienceinafrica.co.za/2003/february/shorse.htm
Sexually.
horses have babies just like humans, exept they're horses, of course
Horses can have there babies on land, but if the owner wants there horse to have a baby in a barn or somewhere they would keep it there until the horse has the babies (the owner will know round about what month the baby or babies are coming.)