Chemical Exposure in the Womb Hurts Male Fertility

Men's fertility problems might start before they're born. A new study found that exposure to endocrine-disrupting chemicals in the womb is linked to worse sperm quality decades later.

What Happened in the Womb Shows Up in Adulthood

A 2026 population-based cohort study in Andrology measured how fetal exposure to a mixture of endocrine-disrupting chemicals affects male fecundity (the biological ability to reproduce). The researchers looked at biomarkers of chemical exposure during pregnancy and then tracked sperm quality and reproductive health in the sons as adults.

The key word here is "mixture." Most studies test one chemical at a time. But real life doesn't work that way. We're all exposed to dozens of hormone-disrupting chemicals at once. The study looked at what that cocktail effect does to a developing male fetus.

Which Chemicals Are We Talking About?

The mix includes phthalates, PFAS, pesticides, and bisphenols, all common endocrine disruptors found in plastics, food packaging, personal care products, and household dust. Pregnant women are exposed to all of them simultaneously, and those chemicals cross the placenta.

The result: men who were exposed to higher levels of these chemicals before birth had measurably worse biomarkers of fecundity.

What You Can Do

If you're pregnant or planning to be, reducing chemical exposure matters for your baby's future fertility. Avoid plastic food containers, skip fragranced products, eat organic when possible, and dust your home regularly. Start with non-toxic baby products to build a cleaner environment from day one.

Also see glass food storage for safer alternatives.

Source: Hull et al. (2026). Andrology.