Though I said my earliest memories were when I was 3, they were just flashes. I can use context I now know to place when those memories had to be. 4 is the same, although there was slightly more to the flashes.
At 5, I could remember moments but not anything anyone said. 6 is the first time I can remember incidents and anything that was said during those incidents. That's when my first full memories are from.
I always thought my situation was the norm. I'm surprised there are people who remember things as early as I've seen in this thread.
There is no "norm". Everybody is wired differently. But, if it makes you feel better, I was brain damaged at birth, which caused my cerebral palsy. It could be that THAT is the reason for my remembering the incident with my baby bottle that I described. I also remember being 1 year old (well, one incident), 2 years old (same), and three years old (also one incident). At four, my memories started in earnest.