O what a little beauty!!
I'm jealous. I try to encourage our babies to eat as soon as possible - whether it be from mom's feed bucket (usually works better when fed from a tub and mom is OK with that - my 2 mini sized Shetland mares will actually attack their foals if they try to take food out of mom's bucket.) or from their own. I also teach mine to stand tied while eating - mom is tied at her bucket and foal starts with a line around their barrel thru the loose part of the halter at the bottom of the noseband or thru an attached larger ring and then wrapped around the post. I make sure that I turn them loose before they get so tired that they lay down. With some foals that can be a very short time (5-10 minutes) at first. Then you go longer periods. I also use this time, or try to - sometimes Im running harder to feed the rest of the crew lately - to handle the foal - rubbing her body, picking up her hooves, touching her ears. Some foals will not like being touched while eating - deflect a bite with your arm or other body part at first if your baby tries to bite you. All of ours learn that handling at feeding time is to be expected and accepted...
Of course there are other ways to do the above handling and initial training.
We live in NC and all vets here in our area seem to concur that foals should be wormed with Panacur at 30 days of age, Strongid at 60 days. Then they vary - some say rotate back and forth till 6 months, some say on 90 day worming go to Ivermectin and use Ivermectin for 4th, 5th & 6th month. So, in the past, we have done the 30 day worming and every 30 days there after until 6 months of age, they are wormed. At 6 months of age, they "join" the rest of the herds' next worming which takes place every 60 days. I have had several foals' fecals checked when I decided to skip a worming - the foals that were skipped had heavy egg counts &/or actual worms while foals that had been wormed had less - though never none. We do have a large number of ponies on our place. We are checking into going the more natural route now - but didn't have any foals in 2014 and none planned in 2015. We are researching the best way to deal with foals and natural products worming and IF it works.
You should check with other horse owners in your area to find out how they worm their horses AND talk to your vet. Local pastures, weather and animal load can affect choices of when to worm your horses and what with.
I can't answer on your registration color questions.
More pics of your lovely girls? The name you decided on?