If it is swayback, there's nothing you can do about it now. The copper deficiency is in utero, when the skeleton is getting laid down - if you and your vet decide it is swayback then you will need to look at copper supplementation of your ewes midway through gestation in future.
I have in the past had lambs that were skew-iff, expecially with the head seemingly unable to turn in the right direction, and lambs that were 'flop-bot' - simply couldn't get on their feet and stay there, and lambs that were squished - rib cages flattened - and almost all came right in time. I don't think any of these were swayback although I have wondered if the flopbots were linked with copper deficiency - but as they came right I think they couldn't have been.
With swayback they don't come right, they deteriorate as they get heavier and the stresses on the skeleton increase. In fact it can be unnoticeable in newborns, becoming evident as they grow. Swayback is a brilliantly descritive name; as they get heavier they get a pronounced sway at the back end as the spine struggles to keep straight. On the moorland farm, where we did supplement all the ewes, we nonetheless had one wether lamb who had a real side-to-side sway from about 3 weeks old. We did manage to get him away, however; as soon as he hit the bottom end of target weight and condition, we got him off.