What do kids leave for Santa Claus?

Milk and cookies. When the children wake up in the morning to see the cookies and milk gone, they know Santa has visited. The most common items children leave for Santa are cookies and milk. Some will also leave a carrot or Apple as a little treat for Santa's reindeer. The most common items children leave for Santa are cookies and milk. Some will also leave a carrot or Apple as a little treat for Santa's reindeer.