My earliest memory is, I think, of when my younger brother was born about a year and a half after me. I remember looking at him through the glass between the hallway and the babies and being told who he was. That didn't make any impact on me because I did not yet understand the concept of brothers and sisters even though I had two older brothers and an older sister.
I also remember learning to walk and my parents and my sister sitting on a sofa encouraging me to walk.
I also remember being potty trained. I don't remember being told anything in particular, but I'm sure that they did. What I remember best was that I couldn't see the point of being potty trained because we already had the situation well under control.