The Care and Feeding of Lambs

So, I am at work (lunch) and worrying about the little ewe lamb.  She seems active and she's not crying, but I am just wondering if she is getting enough milk.  Her little tail isn't moving, and she just seems thinner than the ram lamb.  They seem to go to the same side, but I don't see any unevenness in the udder, milk seems to be flowing.

I am probably worrying too much, as usual, but I am wondering if I should pick up some milk replacer just to give her a bottle or two a year.  I read that a ewe might not have as much milk as a more experienced ewe.

I worried over the last ewe, too, and one of the rams - and they are huge now!