We are in the same quandary with ours. We bought them in-lamb and the dates turned out to be widely separated and blinking inconvenient! First to lamb was happy on her own with her babies for a week, then started to whinge, so have brought in the next (still two weeks away) to keep her company.
Terrified of foxes so bringing them all in at night - now they have the idea we just open the gate and they trot into their night quarters so we assume they approve
The two later lambers are still out with the wethers but feeding them separately hasn't been too much of a prob in our case - the wethers are greedy enough to be lured into a pen to munch on chaff and then we give the ewes theirs.
It has all been a bit of a juggling act (pause to form a mental pic of juggling sheep
). We have had to put up temporary pens in the orchard for the newly turned-out ewes/lambs to give them clean grass where we could keep a close eye.
Next year a) NO January lambs and b) a closer lambing pattern. All a learning curve isn't it?