Then, they go to a larger stall with one or two other ewes and lambs.
That's when life gets interesting. Up until then, the lamb could just approach a big, warm furry creature and root for milk. Now, they have to go to the correct furry, creature.
Ewes identify their offspring by their smell. When an intruder lamb comes into their zone, they let it know with a head butt.
In this video, two ewes and their lambs were put together in a stall. Notice how the ewes sniff each lamb to ensure it belongs to her.