But it's also an opportunity to teach them why we celebrate Christmas. Instead of focusing on what Santa will be bringing them, it's a great time to share how this day is for celebrating God's plan to come to us in the form of a baby.
One resource that my kids really enjoy is the "What's in the Bible" series that was created by Phil Vischer (the Veggie Tales guy). He has a specific DVD for this time of year entitled "Why Do We Call it Christmas?" It's a great resource to teach your children about the origin of the Christmas celebration, how Santa fits in, and more.
You can find out more about the video here.
There is also the free resource on You Tube entitled "The 12 Questions of Christmas."