Can biodegradable PLA plastic packaging harm a developing baby during pregnancy?
PLA can break into very small particles. In a 2026 mouse study, PLA-related nanoplastics crossed the placenta and were linked with slower fetal growth. Human risk is not fully known, so use extra care with hot food.
What it is
Polylactic acid (PLA) is a plant-based plastic used in compostable cups, lids, takeout boxes, and utensils. It is often sold as a better choice than regular plastic. But plant-based does not mean body-safe. As PLA breaks down, it can shed very small pieces called nanoplastics.
What the study found
A 2026 study in PLoS Biology tested PLA-related nanoplastics in pregnant mice. The particles crossed the placenta and were found in fetal organs.
The study found that these particles disrupted normal blood vessel growth in the placenta. The researchers linked this to changes in the VEGF and GATA2 pathways, which help the placenta move oxygen and nutrients to the baby. The exposed pups had intrauterine growth restriction, which means they grew less than expected before birth.
This is an animal study, not proof that PLA packaging causes the same harm in people. Still, it is a useful warning: a compostable label does not prove a material is safe for pregnancy exposure.
What to do
Use glass, stainless steel, or ceramic for hot food and drinks when you can. Do not microwave PLA containers. If takeout comes in compostable plastic, move the food to a glass or ceramic dish at home.