Boys born to women exposed to hairspray in the workplace may have a higher risk of being born with hypospadias, a genital defect.
BBC NEWS | Health | Hairspray linked to birth defect
The incidence of hypospadias - where the urinary tract is found away from the penis - has risen sharply in recent decades, and some experts have pointed the finger of suspicion at chemicals called phthalates, found in some plastics, including those found in hairspray.
Phthalates have the ability to disrupt hormones, and have been banned in toys in the EU for some years.
The latest study looks not at personal use of hairsprays, but at their use, potentially in higher doses, by workers such as hairdressers and beauty therapists.