A normal equine pregnancy lasts almost a year. Generally 340 days is the average length of gestation but foals may be carried 3 to 4 weeks longer. Colt foals are typically carried longer than fillies. A foal delivered after 310 days is considered premature.
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At 1 month, the equine foetus is 3 inches, or the size of a hen egg. One month later the foetus has grown to a length of 5 inches, the size of an orange.
At 12 weeks, the unborn foal weighs up to 113gr and is already the size of a football. The sex of the foal is now visible. At day 150, the foetus is the size of a rabbit and gaining more than one pound every 10 days.
Between the fifth and sixth month of gestation, the foetus develops hair on its lips, nose, eyelids and eyebrows. At 8 months, the foetus is the size of a small lamb and weighs between 19 and 33 pounds. It is between 20 and 32 inches and is beginning to form hair on its mane and tail.
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At 11 months, the foetus weighs up to 59 Kilogram and is between 30 to 58 inches. The lungs are developed and it has a normal hair coat.
A new foals legs can support its considerable weight upon birth. The new baby is about the size of a German shepherd.
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