Not as easy as that Plums.
The lambs of Dad's with Nematodirus (ie worms) were scouring dreadfully but it was green, as it was with my goat kids when they had cocci.
It can, of course, just be lush wet grass. But after that experience a fortnight ago, completely out of season, I wouldn't assume it was just the grass. That's what Dad's neighbour did and by the time I saw them two days later, one was so ill she died.