With respect to personal development and trauma, some suggest that the normal person that was at the onset of the trauma is kind of put on hold while the person that has to be to survive the trauma does what they have to do. The idea is the normal person (inner child in the case of childhood trauma) is still there looking for it's needs to be met.
I certainly feel I have a 3 or 4 year old little boy looking for the mom that might have been. As an adult, I have a good relationship with my mom and care for her very much, but she wasn't the kind of mom the little 3-4 year old boy needed at that time. Sometimes when confronted with someone who appears to be the kind of mom that might have been, the little boy, comes out, as charming and adorable as a child can be, seeking affection and parental support.
In a similar way there is the 19 year old that went into the service and off to war, just as there are a lot of young brides who went off to a marriage that was not the way it should have been, and so on.
So with respect to personal development and trauma, there is an "inner child" still looking to get it's needs met. The problem is the person after the trauma is older and in a different situation. It is not possible to go back and meet the needs that were put on hold while we did what we had to do to survive the trauma. But at the same time, it is an important part of therapy to recognize the "inner child(s)" that are still on hold and process those thought and feelings. A child that is put on hold, told to go stand in the corner, only knows they did something wrong. So the theraputic process is addressing that deep seated feeling that we are a bad person, that we did something wrong.
The term inner child can be confusing for trauma survivors because there is also a branch of psychology that talks about the inner child and parent and developing adult. Trauma survivors need to rediscover the normal child that was put on hold to address that feeling we did something wrong, that we are a bad person. At the same time, we need to understand we can't go back to that point in time and start over. Once we begin to understand we are ok (not a bad person) then we can begin to look at ourselves as a normal, healthy person challenged with living with our set of ptsd symptoms and assess our current needs in our current situation and develop a healthy set of activities and relationships for the current us.
At least that is what the term "inner child" is all about to me.
Ted