I had a fine childhood. Nothing I would consider abnormal in a traumatic or negative sense, and the fidelity of my memories have always been limited. Some brains just aren’t designed to hold onto the past … which is quite comical because I the things I do remember, I remember strongly; even when they’re essentially irrelevant. Oh well.
This would actually make a huge amount of sense. Your brain literally chemically rewires during puberty, so I imagine there’s also varying degrees of memory pruning based on frequency of access and interrelatedness.
Related: https://scitechdaily.com/mapping-neuroplasticity-how-pregnancy-rewires-brain-architecture