The traditional approach to parenthood is completely unsatisfactory. Women have to spend many hours in child-rearing. Those with professional skills many sacrifice their career in all respects for the benefit of only one child. Because women spend time caring for their children, the services of many expensively trained teachers, nurses, doctors and other professionals are altogether lost to society. Even if child-rearing is shared by the father, it simply means that two people waste time on an unproductive task for which they may be entirely ill-equipped.