We have only ever had one baby. He just turned a year Aug 5th
I was able to send his mom away for 2 months to a great horsey friend. Chocolate Thunder our foal was home with his older sister he did just fine with mama away.
When Rainbow, his mom came home in just a few days he tried to nurse! I only had 3 horses at the time and no way to seperate. He still trys to nurse now and again, but not too often. Rainbow has no udder so I am not sure if he even gets anything.
I have seen recently a nursing prevention muzzle (I am sure it is not called that but I couldnt think of how else to describe it lol) Maybe try that . Ok I just found what it is
Ezee wean halter
weaning halter
I have no idea how or if it works but you might want to check it out.
Or like others said if you can give him a friend in a seperate pasture. That was not possible for us. It does take a long time for them to give up on the milk bar!