Ime early memories vary wildly from person to person.
My earliest- being born. Now a memory of a memory, but was there til maybe 7yr old.Many other clear memories, being in pram, travel, holidays, before 2. In these, I can clearly remember what I was feeling.
3 of my DC claim to have no memories before about 4 , although they sometimes come up with a fragment that I can date before then.
One DC has phenomenal memory, eg in his teens described an event on a family outing when he was 1. I thought it must have been recounted to him, but he could describe the place in detail, somewhere we've never been since. He can remember visually- it's as if he consults pictures of his past.
I can remember in a tactile way. I didn't learn about different kinds of wood till I was in my thirties. Touching eg beech wood, I could then identify which of my preschool toys had been made of that, also that Granny's furniture was oak.Because I could remember what they felt like.
So I wonder if someone who uses words or concepts to remember things simply has less of a framework to do that until a bit older,iyswIm.