“Mammals’ brains make new cells throughout life — a process called neurogenesis — but babies of some species, including humans, produce new neurons at a much higher rate. And this process is particularly active in the hippocampus, which deals with memories and learning.

Most of the time, neurogenesis leads to better learning and improved memory. But there’s a catch. According to the Science paper, the extremely high rates of neurogenesis seen in very young brains can actually increase forgetfulness. These new neurons could be crowding out the old circuits that hold memories.”

http://www.vox.com/2014/5/8/5695500/why-cant-you-remember-being-a-baby-science-explains

“That is how we all usually respond when our memory is challenged. We have an abstract understanding that people can remember the same event differently. The film ‘Rashomon’ made this point more than 60 years ago, the Showtime series ‘The Affair’ presents each episode from two conflicting viewpoints, and contradictory witness testimony is a crime drama trope. But when our own memories are challenged, we may neglect all this and instead respond emotionally, acting as though we must be right and everyone else must be wrong.”

http://www.nytimes.com/2014/12/02/opinion/why-our-memory-fails-us.html?_r=0