Your girls are lovely!!!!! That said, lesson # 1. Never turn foals out with their halters on. Especially since your girls do not know how to lead and give to pressure. If their halter gets caught on something, the will instinctively fight against the pressure. NOT GOOD.
I've had to work with foals that the owner had not bothered to spend the time teaching to accept a halter and learn to lead. I suggest trying this: take the halter into the stall with you. You say they are
accepting of you touching, brushing them etc. So incorporate that into the grooming, but use the halter, rub it on their bodies, find their sweet spots where they enjoy being touched and do it with the halter. As they accept what you are doing and are comfortable with it,gradually work your way slowly up the body, neck, doing BOTH sides of the body, until you can rub the halter all over their face without resistance. This will take some time, but foals are quick learners, and if you take the time to do this consistantly several times a day, I repeat, several times a day, by day 2 or 3 at the latest, they should accept a halter with no problem. As for leading, once you have them accepting the halter, teach them how to lead in the stall while using a butt rope on them.
I'll let someone else in here step in and explain leading and use of a butt rope with because typing all this on my phone is ...a pain in the butt.... Lol
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