Your quad lambs are so cute! They are adorable. Could you do supplemental feeding with 4 bottles once or twice a day? Or will the ewe raise them all? What breed is she?
I know some smaller goat breeds often do 4-5 +.
She had them at a clinic...C-section I think. Forgot where. I was so amazed! My step-kids had an English Setter that had 17 once...normal delivery but they just kept coming. 
My sister has had them for years. I grabbed them along with some other mending and sewing projects when we visited for her husband's funeral. One is almost done and ready to send back. Only question left is whether to add an embroidered patch with the history of the quilt on it.
I mean, she has two.