The thing I find most interesting about childhood amnesia is that that, despite this headline, it's not that we don't form early memories. We do form them, and then as we get older we forget them again. If you ask a 5-year-old child, they will accurately remember things that happened to them when they were 2. Then they gradually forget, and at 11, the early memories are completely lost. https://en.wikipedia.org/wiki/…
I also imagine the first 4 years as a massive influx of raw stimuli to be processed, from which only a few abstraction will remains. Kinda like learning anything knew, the first period is mostly wrong perceptions, and you only remember the valuable bits after an integration period.