Why don't we remember being a baby? New clues in memory mystery.

What's the earliest memory you can recall? While many people's recollections of the past may stretch back into childhood, research shows that the trip down memory lane generally hits a wall once you reach infancy. In some ways, this doesn't make much sense--after all, the first years of a baby's life are when they learn foundational psychological concepts, form relationships with caregivers, and gain a sense of self. Experts have long attributed this "infant amnesia" to the development timeline of the hippocampus, the region of the brain responsible for retaining memories. But according to new evidence from a team at Yale University, the explanation for early our memory blocks may be a bit more complicated.