I have a handful of 5 month old calves. My cows are starting to look skinny. What's best to do. Wean my calves now (I usually do it at 7 months) or wait it out and let their mothers go down hill a bit more? All the cows are about 3 months pregnant. With them being pregnant, the cold and with a calf on them, they have lost a bit of fluff. I nose flapped half of them. We are debating if we do them all. What would you do? Is 5 months an ok time?