Scientists hope the research will bring us a step closer to create organs for transplant.
If confirmed, the creation of genetically modified babies has profound scientific and ethical implications.
Some of the eggs were stored in the 1980s, according to hospital staff.
Swedish scientist says his work could lead to new ways to treat infertility and prevent miscarriages.
Some say the technique could eventually be used to create "designer babies."
Scientists said genetically-modified children could be "morally acceptable" in the future.