What exactly is the placenta, its function, and why is it essential to the survival of a developing baby? What are some common placenta problems women may face and how are they overcome? What is placenta previa? Placenta abruption? What can expecting mothers do to help make their placentas strong and healthy? What is the lifespan of a placenta? Certified childbirth educator and owner of Babies in Bloom, Rochelle McLean is this week's PregTASTIC expert.