Are UV filters from sunscreens during pregnancy slowing baby brain growth?

What's actually in it

Many conventional sunscreens rely on chemical UV filters that are designed to soak into your skin. While we don't yet have direct data on these specific filters slowing brain growth, we do know that your body absorbs a wide range of environmental pollutants during pregnancy.

A 2026 study in Environ Int identified complex mixtures of pollutants that interfere with how your body processes amino acids and fatty acids. These nutrients are the building blocks your baby needs to grow. When these pathways are disrupted by chemical exposure, it can change how your baby develops in the womb.

What the research says

Current science is focused on how various chemicals, rather than just one, impact pregnancy. A 2026 study in Environ Int found that mixtures of pollutants are linked to major changes in metabolic pathways during early pregnancy. These pathways are critical for healthy fetal development.

Other research highlights the risks of common household chemicals. A 2026 study in Curr Environ Health Rep explored how environmental chemicals are tied to maternal depression, which can also influence the pregnancy environment. Additionally, a 2026 study in Biol Trace Elem Res shows that exposure to heavy metals like chromium during pregnancy can have sex-dependent effects on how a fetus grows.

While we wait for more specific studies on UV filters, the existing peer-reviewed research makes one thing clear: what you put on your body can enter your system and affect the delicate balance of your pregnancy.