Kirsten is trying to remember events from her life as an 18-month-old. however, as hard as she might try, she has no conscious memory for anything that occurred before her third birthday. this is likely due to the fact that her which is involved in storing explicit memories, was not fully developed at that age.

Hippocampus

Explanation:

According to my research on studies conducted by various neurologists, I can say that based on the information provided within the question this is most likely due to the fact that her Hippocampus was not fully developed at that age. The Hippocampus is the area of the brain that controls and maintains long term memory. Which is why she can not remember that part of her life.

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