yes even i agree with mike. Childhood memories are quite random and based on some unique mechanism
I'm not so sure they're random, and I think we remember them all. I simply think we don't recall them until something trips the memories.
The reason I say this is because I've gotten together with childhood friends over the years who've said, "Do you remember when..." and as soon as they mentioned it, before mentioning any details, the entire escapade flooded back into mind, including conversational/situationl details. I simply had not recalled it since the event took place.