OMG, he's just too stinking cute!!! I can't wait to see more pictures of him as he grows up.
One little word of unsolicited advice though, be careful to not baby him. That's where a lot of people get in trouble with orphaned foals and end up with completely unmanageable weanlings/yearlings. Truthfully, if he were mine, I would separate the mellowest of the horses and put him in with it. That way, he still gets the companionship and herd hierarchy (and punishment when needed) from another equine. If they got along well, I would go ahead and put him out with the herd too within a couple of weeks and just monitor them very closely for a few days.
My foal that wasn't even orphaned developed a bit of an attitude problem and the best thing I ever did with him was put him in a paddock with an alpha horse. Not only did the alpha take him in and 'protect' him from other members of the herd, but Dobe also put the little guy in his place when he tried to stud up.