I give you kudos for raising sheep. We know a guy that has some sheep a when they're lambing he said if you don't show the mother ewe the lamb right away she might reject it and than you are SOL. I like calving more, it's easier if you have the facilities for it. We've lost to many calves this year already because of stupidity, but it's still easier. But they're all cute just the same, calves and lambs :)
Actually,we find them to be real hardy,and much smarter than people give them credit for. :) I think some does depend on the breed,as I know some are much hardier then others,but with ours we very rarely have issues;the majority lamb on their own,mother up well,and it never ceases to amaze me how tough those little lambs can be.Occasionally we'll get a first time mom who's a little uncertain at first of what this thing is that just popped out,lol,but give them a few minutes and they're good to go! We keep a pretty close eye out during lambing because we get mainly multiple births (twins,triplets,the occasional quads) and there's more of a chance of things going wrong,such as babies getting tangled during the birthing process,ect. But it's not very often that we have to step in and help.I like them because of their size and easy keeping;they don't require much for facilities or anything special,and they're small enough I and my mom can handle them completely on our own.
That's too bad about the calves,I hate losing babies! But,as they say,"You got livestock,you're going to have some dead stock." Thankfully,we've only lost two lambs,and we're almost done for the season. Both were stillborn,from separate multiple births,so nothing we could have done. I hope the rest of calving season goes better for you!