The book is based on morality and womanhood. Cassy kills her baby, because it was the only choice left. She was a slave and there was no chance for her to raise the baby. She decided to kill the baby and this clearly is a moral weakness.
The themes of the book include morality and womanhood. Cassy commits infanticide not because she wanted to do it but because she had no choice. She was a slave and that meant she did not have the capacity to raise the baby. Despite this, she still made her decision to kill the baby and that shows her 'moral weakness.'
