Psychologically, we think there will be memories from birth, but we don’t always remember childhood memories.
Our earliest memory is probably formed between the ages of 2 and 4. At this time, we can remember many things that happened at that time, which is called instantaneous memory. Most of the memories at this time are forgotten. If there are some special memories in instantaneous memory, they will attract our attention and form a short-term memory.
Short-term memory will be forgotten if it is not repeated, and only after it is repeated will it become a long-term memory. Long-term memory generally has two outcomes: one is forgotten and the other is permanent memory.
The expression forms of long-term memory are divided into recognition and reproduction.
Reappearance is what we usually call memory, and recognition is still knowing when things that have been experienced before reappear.
Generally speaking, it takes seven years to form a connected and logical story memory, which is usually the part of reproduction.
Before the age of three, there are some strong or repeated events that can be manifested by recognition. For example, some children are chased or even bitten by dogs. When children meet dogs again, they will be afraid and unwilling to approach dogs. This is actually memory.
There are also some that will internalize and form one of our subconscious minds, which can be reproduced through psychological hypnotherapy.