Do phthalates and bisphenols give babies allergies?

What's actually in it

Phthalates and bisphenols are in plastic food containers, vinyl flooring, personal care products, and canned food linings. Pregnant women are exposed daily. These chemicals cross the placenta and affect how the baby's immune system develops.

Allergies happen when the immune system overreacts to harmless things like pollen, food proteins, or dust mites. If the immune system is skewed toward overreaction before birth, allergies become more likely.

What the research says

A 2026 study in Environ Pollut used data from two birth cohort studies to track how prenatal phthalate and bisphenol exposure affected childhood allergies. They followed children from before birth through early childhood.

Children whose mothers had higher phthalate levels during pregnancy were more likely to develop eczema, wheezing, and allergic sensitization. The effects were consistent across both cohorts.

Bisphenol exposure showed similar patterns. Higher prenatal BPA and BPS levels were linked to more allergic outcomes in the children.

The researchers think these chemicals push the developing immune system toward a Th2-dominant state, which favors allergic responses over infection-fighting ones. This immune skewing happens before birth and carries into childhood.