Sigmund Freud first formulated the theory of “ infantile amnesia,” saying that
we suppress memories of events that happened before the age of 3. Today, scientists
believe our inability to remember our infant and toddler years has more to do
with the brain’s neurological immaturity and the child’s undeveloped language
skills. Recent studies suggest that memories start to form when a child’s ability
to reason fully has developed, usually around the age of 4. At this age, children
can use words to ‘file” away memories.