It’s a great question. In the research that I’ve done, I’ve come to the conclusion that Charlotte’s remarks about a child being born neither good or bad has to do with character, rather than theology. It seems that during the era in which she lived, there was a mind-set that if a child inherited a particular trait that ran in the family (for example, a bad temper), there was nothing the parent could do to change that. The child was “born bad” and would be “bad” his entire life. Charlotte’s emphasis on habit-training focuses on many character traits and demonstrates that a parent can help a child change a negative trait. So as far as character issues go, a child is not locked in to natural tendencies. Habit is stronger than natural tendencies and can change those inherited traits for the better.
In Volume 4, page 180, Charlotte talks about the sin nature that we all have:
“There is in human nature an aversion to God. Whether it be, according to the Article, that ‘original sin which is the natural fault and corruption of the nature of every man that naturally is engendered of the offspring of Adam,’ or whether it is that jerk of the shoulder from the hand of authority which belongs to freewill, we need not stop to inquire. Anyway, there is in human nature, as well as a deep-seated craving for God, a natural and obstinate aversion to Him.”