If you syill have some of the "YUCK" stuff from when your doe kidded they say to rub it all over the kid to make mom think its hers from the scent...??.. Id be careful though..sometimes does can get rough with kids that aren't theirs..You may end up having to bottle feed...
BEST OF LUCK!!!
You could try rubbing her milk on the baby...??.. I don't know..my advice has been only from what ive read from others....ive never dealt with this issue..im sure someone that knows more will chime in soon..
Usually you don't, unless she is willing to adopt him. If it is necessity, try putting her in the milking stand and letting the baby nurse 3, maybe 4 times a day - you will probably have to hold a back leg, or tie it back as she will try to kick the baby off. If you have to tie it back, use a thick, soft rope so the doe's leg doesn't get skinned up or hurt. Do that for several days, maybe a week, then try him with her. Sometimes a momma will accept a kid that isn't her's once her milk starts working through him. No guarantees, but sometimes it works. You might also consider separating her from her kid, putting the new baby in with her kid if they are of a comparable age, and then letting them both nurse at the same time with Mom in the milking stand. Sometimes a doe is a little more reluctant to kick if her kid is also nursing. With that scenario, you can sometimes hedge your bet a little by putting both kids on the same side with the adoptee on the inside. Mom is more inclined to not kick if it means kicking her kid.
here we "shark" the kids. As you dont leave a single on a doe (if you do, you are going to end up with a uneven udder that will not produce as good in both halves. So we pull the kids, and twice a day bring the mom into get milked and put both babies on her. Now with yours being so young, the uneven worry isnt a factor yet. So Id suggest pulling the baby for an hour and then grabbing both kids and put them on her while the doe is locked into a stand. The doe will fight and be pissed but over a course of a couple of weeks, she will get to know the smell and sound of the other kid and should adopt it. This is not a for sure thing and you may find yourself doing this for the next 3 months. Good luck