I think I pretty much went through many of the "standard" fears that come as kids go from one stage to another. My parents were warm and loving, and we had a peaceful home; so I was a pretty secure kid. As a preschooler I had one uncle that I hated but wasn't afraid of. He was just loud and thought that the way to relate to little kids was to tickle them. He didn't visit often, but when I'd hear that he had shown up I'd hide (and of course, not respecting little kids, he'd come looking for me.) I was cautious with some outsider adults because so many had a tendency to talk to me as if I was (as I thought of it) "one year old". I wasn't afraid of them either. I was just cautious because I didn't know how to reply to what seemed like "stupid talk" to me.
I went through my being afraid of burglars thing. Then there was a fear of the house catching on fire. When a hurricane came I worried about flooding. There was fear of my parents dying, but mostly my mother. Kids around five/six often fear that. It didn't help that my mother was hospitalized for several months with an infection. Here's a weird one: Because my father would occasionally say he'd seen a really big rat near the place he worked, I guess that's the reason I went through a thing when I wouldn't hang my arm over the edge of the bed "in case any rats came". (lol) To this day, I really haven't seen any rats "in person". (lol) Since it was the 50's I did go through a thing when I worried about planes dropping bombs )my father explained they were commercial flights. Oh... I went through fear of sidewalk plows. Once I was ten or so I actually got mildly fearless and daring for awhile - not a big thrill-seeker, but kind of fearless in my non-big-thrill-seeker way. Went through a temporary fear of nuns and priests when it was time for Sunday school (because I didn't think it was "normal" for them to dress in black and "all live together". That was when I first started Sunday school, and they were all "foreign" to me. and my mother thought I'd be fine just going in alone (the way I'd been with starting public school). She learned better. (lol)
Oh - I did develop a fear of getting hit in the chin with a baseball; but that was kind of learn-from-experience type of thing. :)