I have DID. I wasn't abused; my mom was quite ill when I was born-and I was also ill with the same illness although that was not detected at the time. She was unable to care for me due to her illness and possibly due to her (at that time undiagnosed) mental illness. Being sick and neglected apparently started me on the track to having DID. So, yes.

I know other people who were quite ill when born, or premature who have PTSD or DID as a result.

There is also the possibility of not remembering abuse. That is quite common for people with DID.