Depends on the stallion's determination, sometimes the mare can also help.
And honestly, you shouldn't have to forego an entire year's worth of riding. You can ride through the pregnancy so long as the mare is comfortable, just not an overly strenuous/hard ride. Some mares can go on gentle rides a week before giving birth so long as they have had regular exercise. It is also good for the mare to get a work out during pregnancy, tends to help the birthing experience with good muscle development. You can also do light riding while ponying a foal, frequent nursing breaks, and teaches basics of ponying from an early age. I don't suggest letting baby run free, too many things can happen. As the foal grows, your rides can get longer, and give good early experience to the foal.
I would suggest to start looking at stallions in your area now to get an idea of what is available. Focus on conformation and temperament in stallions between 10 and 11.2hh, you want a well formed foal with an easy temperament to be used in a pony club. It would also be good to bring along someone who could provide additional critique. Or take conformation pictures and post them on the forum to get critique. Any other features of the stallion are just icing on the cake, just remember that size and color don't make desirable quality babies. :)
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