Do plastic highchair trays release chemicals when cleaned with hot water?

What's actually in it

Plastic highchair trays are typically made from polymers that are not designed to withstand high heat. When you wash these trays with hot water, you are essentially accelerating the breakdown of the material. This process releases microplastics (tiny plastic particles) that can end up in your baby's food.

These materials are not stable. They are prone to shedding particles when exposed to heat or physical stress. When you scrub a tray or rinse it with hot water, you are increasing the likelihood that these synthetic particles will transfer to your child's meal.

What the research says

The science is clear: heat and handling cause plastic to release particles. A 2026 study in Environ Sci Process Impacts found that heating plastic materials leads to the release of microplastics. This is not just a theoretical risk; it is a measurable physical process.

Other research confirms that everyday handling of plastic items increases human exposure to these materials. A 2026 study in Water Res demonstrated that standard storage and handling of plastic containers significantly increase the amount of nano- and microplastics present. a 2026 study in Sci Total Environ showed that physical stress on plastic surfaces results in the shedding of plastic particles. When you combine the heat of your tap water with the scrubbing required to clean a highchair tray, you are creating the exact conditions that lead to microplastic contamination.