They are both Jerseys. Covered with their winter coats, in another 12 weeks they will shed the furry stuff. The song birds will gather up tufts of the fluff and weave it into their spring nests.
The light colored one is the heifer, a young female. The one with darker trim is the male, the bull calf.
Experts tell us these two must be separated soon. Even when they still look like babies they can be mature enough to reproduce. The heifer is too young yet to carry, she still needs to build her own bones, grow out to her maximum size.
Life cycles. Helping and preventing is what the farmer does.