When we observe children, we often find them crying over a broken toy for one second, then playing happily with another toy in the next. Or, they argue with a friend and say, "I'm not going to be friends with you. I am not going to play with you." And in the blink of an eye, the two resumed their relationship. It seems that children are good at forgetting bad experiences and leaving them in the past.

This type of experience makes people feel that children are naturally resilient, and if they are harmed or being attacked, it is easier for them to recover than adults. Even if their recovery isn't immediate, they forget the unhappiness from the past as time pasts. As a result, it will not have any impact on their adulthood.

This book completely overturns this perception. Author Bruce D. Perry tells us that severe trauma during infancy may cause permanent damages to children's brains. Therefore, it will affect the development of a child's personality and daily behavioral patterns. Moreover, it may stay with them for their entire life.