My son was 21 months old when his baby sister arrived. She was born in September and he remembers me walking to the park with him in a stroller that summer. Nothing emotional or traumatic about it. I also have some memories under 2 years old. I have many from under 5. I agree it is easy to get real memories mixed up with impressions or being told what happened, but I think snippets of reality get recorded accurately. I have also heard of a few who had memories from before birth...I don't know about that.