Some would-be parents should give natural methods more time rather than rushing into medical solutions, doctors say.
IVF is now being used so widely that the risks could outweigh the benefits for some couples, researchers have warned.
Doctors say the evidence underpinning the use of IVF in younger couples with unexplained infertility is weak.
Because the technique has risks for the mother and child, clinics should be more cautious about using it, they argue.
Professor Siladitya Bhattacharya, of the Evidence Based IVF Group at the University of Aberdeen, told Sky News that couples would be better off giving nature more time rather than rushing into a medical solutions.