We have 3 bottle baby lambs that are about 3 1/2 weeks old. They are on Sav a lam and that's what they have been on since birth. They are bouncing around, playing, and VERY vocal. This morning when we went out to feed the biggest and oldest (by 3 days) was just laying in the yard dead. No visible signs of trauma, she didn't do a lot of kicking while she was laying there expiring, nothing, just dead. The other two are fine just as all 3 were when we went to bed last night. They have hay, feed pellets, and water available but still were drinking a good bit of milk while learning to nibble on their other food. THe only thing I noticed is that her tongue was slightly blue. I don't know if that's just from being dead awhile or a sign of something. The man we got them from said they had NOT had any shots, but we don't give ours any either. Any suggestions as to what may have caused this or what I need to do for the other 2 to prevent them from dying?