system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't we remember anything from when we're babies?

My earliest memories are from about 6-7 years old. Before that, there is nothing. Why is this? Is there a point where memory somehow matures?
gpt
Your infancy is a critical period of neurogenesis and synaptic plasticity. In short, you don't remember your early childhood because the vast majority of the connections between nerves in your brain have not formed yet. It takes usually about two to four years to get past that period, and even then, your brain is still not fully formed, as synaptic pruning, potentiation, and depression must occur. (In general, the way it works is you form a lot of synapses all over the place, and then the ones that are extraneous or unused are removed, and the ones that are needed and oft-used are strengthened.) 

Basically, there just isn't the neural circuitry required for memory formation early on in your childhood. Most people can begin to remember things around age 4 or 5, but they'll be very fragmented, disjointed memories, because those circuits haven't been embellished yet. Also, it's important to remember that memories can be altered by later experiences. You might remember something from when you were 5 occurring in the house that you didn't live in until you were 10, for example. Hope that helps.