Scientists at Harvard University have just published a study warning that many common objects in your household may be harming you fertility. Yoga mats, sofas, and even car seats all contain a common flame-retardant chemical that could be preventing people from getting pregnant, the study claims.

The findings, published in the journal Environmental Health Perspectives, examine organophosphate flame retardants (PFRs), which is a class of chemicals used in many everyday objects to make them less flammable. But they may contain a hidden danger, with the study reporting that those with the chemicals in their urine were 10 percent less likely to achieve fertilization.

In addition, they were: 31 percent less likely to have a successful embryo implantation; 41 percent less likely to get pregnant; and 38 percent less likely to have a live birth.

“These findings suggest that exposure to PFRs may be one of many risk factors for lower reproductive success,” said first author Courtney Carignan, a research fellow in the Department of Environmental Health at Harvard Chan School. “They also add to the body of evidence indicating a need to reduce the use of these flame retardants and identify safer alternatives.”

“Couples undergoing IVF and trying to improve their chances of success by reducing their exposure to environmental chemicals may want to opt for products that are flame-retardant free,” said senior author Russ Hauser, Frederick Lee Hisaw professor of reproductive physiology and acting chair, Department of Environmental Health.