Refreshing to see my old Prof quoted. This is an intensely intriguing area of research, not only the natural occurring phenomenon of infantile amnesia but also the experiments created to explore this area. For example tagging and reactivating engrams in separate contexts has shown us how to essentially create false memories, exposing possible mechanisms of PTSD triggers, further, stressing mothers or pups out in critical post-partem periods has revealed how not only early life stress can impact physiology, but that epigenetic changes can occur in the mother that then affect the physiology and functioning of subsequent litters.