One of the curiousities of human memory is that childhood, for most people, is largely lost. I think I'm not atypical in having a few memories I suspect are genuine, another set based on what I've been told, and mostly no memory at all.
The assymetry between parent and child is one of the more poignant aspects of parenting; one party remembers much of a rather important relationship, the other remembers little.
Why do adults not retain childhood memories? Is there an adaptive advantage to forgetting, or is it simply a side-effect of the way the human brain develops?