Longer Separation for Baby Girl

Another question that is asked related to פרשת תזריע is why there is double the time of impurity and separation for a woman who gives birth to a female, than when she gives birth to a male. The Torah describes how initially there is a seven day separation for the birth of a male, and fourteen days for a female. Following this, there is a thirty-three and sixty-six day period for male and female respectively, regarding the recovery period following the birth. Rav Shimshon Refael Hirsch attempts to explain why there is such a dramatic difference. He wrote that giving birth is a major ordeal for a woman with a mixture of emotions, and highs and lows. The spiritual experience of bringing the baby boy into the holy ceremony of Brit Milah, speeds up the rehabilitating process. The joy of bringing a boy into the Jewish world who will carry on another generation of Judaism, is so uplifting, that the new mother is more prepared to end this period of separation and get things back to normal. This is a purely subjective interpretation to a troubling segment of the Torah.