I have always remembered those things (as opposed to being told them and think I remembered). That’s definitely a difference between most aspies and most NTs, although I have known NTs who say they remember stuff from they were about 3, although mostly limited to one memory or so. I remember the names of most of my toys, my playmates, some of what we played, some of what we talked about, every pet I had and their names, the siblings of my playmates, some of the neighbors that just lived in the stairwell but I had little to do with, most of the plays I was in and some of the plays I just watched my classmates perform. I can’t imagine anything else!
That crap is one of many good reasons I don’t blindly trust anyone, including “professionals”. They make mistakes all the time. Until they can see what I see they can STFU.
No, I don’t think I sucked my thumb, but I may have appeared to at times because I played with my lips (touched them with my fingers) and it may have looked alike.
The next person had a fave fairytale they wanted read to them over and over.