Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
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All the best,
Dr. Getty
Hello Linda!
So nice to hear from you! Yes, Colorado is spectacular!
Congratulations on your new foal! 
What a wonderful experience it is to raise a horse from a baby.
You're wise to take care in feeding him properly so that he grows to his potential. As you know, I recommend avoiding feeds that are high in starch since they can contribute to osteopathic disorders in growing horses. There are many complete commercial rations available, but most of them are sweet feeds, and it is so much more desirable to simply prepare a simple ration for your foal, with supplementation.
Beet pulp (shredded, not pelleted) is perfect for a foal in a creep feeder. However, you'll want to moisten it. So, because it is wet, it can develop bacterial growth if left for hours untouched (especially in hot weather). So, keep this in mind. The extra calcium is important. And, to this, you would add a supplement designed for growth. I recommend Mare/Foal IIP. You can give this to your lactating mare, as well.
Your foal will mostly be nursing, of course, and this will provide the bulk of his nutritional needs. Offer clean, fresh water at all times, along with 24/7 access to grass hay and/or pasture. And, a flake of alfalfa is beneficial, as well, to boost the overall protein quality in his diet.
Keep me posted on his progress!
Dr. Getty 
Where are you from? Bayfield, Colorado