I remember kindergarten pretty well and I remember a few moments before then. One memory I'm sure was from when I was 1 or 2 years old. I think some people can also have repressed memories because of trauma as a child. My parents divorced when I was 3 and ironically I don't remember any of that time leading up to kindergarten.
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Yes, important events affect memory - or remember them very well, or forget completely due to the fact that they are traumatic.