Can BPA exposure during pregnancy increase autism risk in children?

What's actually in it

Bisphenol A (BPA) is a chemical found in hard plastics, canned food liners, and some water bottles. Even products labeled "BPA-free" often contain similar chemicals like BPS and BPF, which act in similar ways inside the body.

These chemicals mimic estrogen and can cross the placenta during pregnancy. That means a developing baby's brain is exposed to them during critical growth windows.

What the research says

A 2026 review in Autism Res examined how bisphenol exposure interacts with genes linked to autism spectrum disorder (ASD). The researchers found that BPA doesn't act alone. It teams up with certain genetic vulnerabilities to disrupt brain development.

BPA affects genes that control synaptic function, the way brain cells talk to each other. It also interferes with epigenetic markers, chemical tags that turn genes on and off during development. When these markers get scrambled early on, it can change how the brain is wired.

Animal studies showed that prenatal BPA exposure led to social behavior changes and repetitive behaviors in offspring, two hallmarks of ASD. The effects were stronger in animals that carried specific gene variants already tied to autism risk.

This doesn't mean BPA directly causes autism. But for families with a genetic history of ASD, reducing bisphenol exposure during pregnancy is a reasonable step. Choosing glass or stainless steel food containers and avoiding canned foods can lower your daily BPA intake.