DS only started at nursery/pre-school in June (he's 3), so this is the first Christmas he's been there. It hadn't occurred to me to do Christmas cards for the other kids (I'm not terribly big on Christmas cards generally), but when I picked him up the other day I noticed there was a Santa's postbox thingy in the room. So, what's the deal? Am I expected to send cards to all of his 'classmates' (there are only about 5 in his room on a Monday, but I think about 10-15 on a Wednesday)? If so, how do I even know what all their names are? What do others do?