If your children or pets are chewing on plastic and rubbery toys with formaldehyde, throw it out.
I learned something a bit late after 2 of my dogs died of the so-called 'cancer'. Formadehyde in the chew toys.

"Long term chronic exposure or short-term
exposure to high concentrations of formaldehyde
can lead to cancer. In animal studies, rats exposed to high level of formaldehyde in air developed nose cancer."

https://resources.perkinelmer.com/lab-solutions/resources/docs/APP__FormaldehydeInToysUVVis.pdf

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In response Just Mee to his Publication

Formaldehyde is also an ingredient in many vaccines...

https://learntherisk.org/vaccines/ingredients/