Pregnant women who take painkillers may be harming the fertility of their unborn sons as well as daughters, researchers have warned.
Scientists have previously said ibuprofen and paracetamol reduce the number of cells that would eventually become ovaries.
But now a British team has discovered they have the same effect on cells that would later produce sperm in boys.
Painkillers may also affect the fertility of future generations by triggering changes in DNA structure which can be inherited, the research found.
The findings add to the growing body of evidence that pregnant women should be wary of taking painkillers.