The BBC reports: Twelve babies have been born using a potentially safer way of getting eggs for use in IVF, UK doctors say.
The naturally occurring hormone, kisspeptin, was used to stimulate women's ovaries to produce eggs.
The pregnancies, reported in the Journal of Clinical Investigation, show the hormone can be used successfully.
Fertility researchers hope kisspeptin will prevent ovarian hyperstimulation syndrome (OHSS), but larger trials are needed to fully assess safety.
A hormone, hCG, is normally used to produce a few eggs for IVF.