Researchers from the Karolinska Institutet in Sweden have developed a stem cell to treat serious genetic diseases for which fetal stem cell type was specially designed. To treat brittle bone disease that is incurable. It creates collagen essential to the growth of strong bones. And testing and fetal stem cell in mice. They hypothesized that In the womb of the animal can be treated with stem cell but is not as effective in humans. The mother's immune system to destroy the stem cell before the baby will get it. Next, they tested the use of stem cell infants by 30 people, half of babies who receive stem cell before they are born, and the other half will receive after they are born. The researchers have not found a way to prevent the immune system of the mother stem cell destroys the baby was in the womb. If the trial is successful, this may make children born with genetic problems have had a better life.