I don't know about that far back, but when my older daughter was about 18 months old, she had autobiographic memories going back to maybe 9-12month of age. Whe

I don't know about that far back, but when my older daughter was about 18 months old, she had autobiographic memories going back to maybe 9-12month of age. When she was 3 years old, she still remembered them. Forget everything about them at age 7.