Are phthalate replacement plasticizers changing baby thyroid?

What's actually in it

When manufacturers remove phthalates from baby products, they often replace them with other plasticizers. These chemicals are used to make plastic soft and flexible. Unfortunately, these replacements are not always safer. A 2026 study in Sci Total Environ confirms that these non-phthalate plasticizers are commonly found in recycled plastic materials used for everyday goods.

These chemicals don't just stay in the plastic. They can leach out and enter a baby's system through skin contact or ingestion. Once inside, they act as endocrine disruptors, which are chemicals that interfere with the body's natural hormone systems.

What the research says

Peer-reviewed research shows that these plasticizers can have serious health impacts. A 2026 study in Ann Med found that exposure to dibutyl phthalate causes thyroid toxicity by killing off important thyroid cells. This process, known as pyroptosis, disrupts the delicate balance of hormones your baby needs to grow.

The risks extend to brain development as well. A 2026 study in Environ Int linked early life exposure to both phthalates and their replacements to measurable changes in brain structure and how different parts of the brain connect to each other. Another 2026 study in Environ Int highlights that these chemicals pose a direct risk to developmental neurotoxicity, meaning they can harm a child's developing nervous system.

Even products that seem harmless, like disposable diapers, can be a source of exposure. A 2025 study in Toxics found that infants are exposed to phthalates through their skin when wearing disposable diapers, which is associated with damage to their DNA.