Can microplastics transfer from mother to fetus in animal studies?
In rats, yes. A 2026 study found orally exposed micro- and nanoplastics moved from placenta to fetus, with smaller particles transferring more.
What is actually in it
Microplastics and nanoplastics are tiny plastic pieces. They can come from food packaging, bottled drinks, dust, and plastic food contact.
Pregnancy research is still new. Animal studies are useful because they can track labeled particles in ways that cannot be done in people.
What the research says
A 2026 study in J Hazard Mater gave pregnant rats labeled nanoplastics and microplastics from gestation day 0.5 to 18.5. The researchers found particle transfer from placenta to fetus, and smaller nanoplastics transferred more than larger microplastics.
The study also found particles built up mainly in the rat decidua, part of the pregnancy tissue, where they compressed tiny blood vessels. This was not a human study, and it did not prove harm in babies.
Still, it supports lowering plastic food contact where it is easy. Use glass food storage for leftovers, and avoid heating food in plastic.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Quantification and visualization of micro- and nano-plastics transfer from maternal to fetal: A rat model study. | J Hazard Mater | 2026 |