Actually many people working on research in cord blood stem cells (HSCs) believe that as of current technology, we have no use for stored HSCs. True, HSCs transplantation has high potential to save your kid when he has a hematological disorder in future, but there is currently no means of "expanding" that small amount of HSCs harvested from birth. So until somebody comes up with a reliable means of expanding these cells, you only have enough HSCs to save your kid up to a certain age. Beyond say the age of 5, there is too little cells to reconsitute your kid's blood system
i have no expertise in ESCs, but we generally don't have a ESC bank for various reasons. True, ESCs are more primitive, meaning they can differntiate into a whole lot more cells, even into HSCs. but we know too little about ESCs, it will take too long before we can do anything with them them. Also I would imagine it would be totally dangerous to extract cells from your fetus at such an early stage of pregnancy.