So far none of the kids I’ve ever known, including myself when I was a kid was afraid of the idea of Santa coming down the chimney into their home in the middle of the night, but lots of kids, especially when they’re about 2 (old enough to recognize different people, but not really understand who they are) get scared enough to start crying when they get taken to see Santa and have their picture taken with him. By the time they’re 3, they usually have a really good understanding of who Santa is, and so they’re no longer afraid. But 2 year olds seem to have the worst time, younger kids, babies don’t seem to have the problem, because they simply don’t know Santa as being any different from every other stranger.