Answer: The hippocampus is the area of the brain which if not well developed until after three years of age, offers a possible explanation for infantile amnesia.
Step-by-step explanation:
The hypothalamus develops at the age of 24 to 33 weeks in a human brain, while the hippocampus is part of the brain which develops till the age of 3-5 years, in a child. Hence, if the hippocampus is not developed by that age, it may be the possible cause of infantile amnesia.