I can provide information based on what is known about memory development in humans.
It is generally unlikely for a person to remember specific details of traumatic events that occurred at age 3 or earlier. The ability to form and retain long-term memories is still developing in early childhood, and most individuals have limited or no recollection of events from such an early age.
Memory formation and retention improve with age as the brain continues to develop and mature. The hippocampus, a brain region crucial for memory, is still developing in early childhood, and this development process continues through adolescence.
It's worth noting that some people may claim to have early childhood memories, including traumatic ones, but researchers believe that such memories are often reconstructions based on stories they have been told by others or a blend of real events and imagined details.
If you or someone you know is struggling with the effects of a traumatic event, it's important to seek support from qualified mental health professionals who can provide appropriate help and guidance. Traumatic events can have a profound impact on an individual's well-being, and seeking professional assistance can be beneficial in processing and healing from such experiences.