How is the lamb doing now? He looks like a sweetheart.
It's good to notice when something is different with your flock. Sometimes something is wrong, sometimes it is not. But it's always good to notice.
It's very difficult to say if there is something wrong without knowing more about what part of the world you are in, what breed of sheep he is, and how the flock is managed.
For example, I don't like the way he is standing in the photos. If you are somewhere with very little sunlight this time of year, and given that the ewes are not shorn and dark in colour, he might be a little bit Vit D deficient. But then again, he might just be standing funny for the photo.
Is that Black Welsh Mountain Mums, or maybe Shetlands? Definitely one of the older breeds the way they are losing their wool and their bone structure. The tend to grow a lot slower than the modern breeds, so that might account for why he is off to a slow start.
If he can nurse,
pee and
poop then it's usually going to be okay. Best to watch and see.
Hope he is doing better.