Yeah, two-year-olds love to put random found objects in their mouths, often accidentally inhale them, and often lack the correct throat motions to unstick a round object.
It takes a long time before any of the other senses become mature enough to be (more) useful avenues of accruing information and parents can finally stop worrying about it.
They said that most just pass though the digestive system, I was special
Would there be downsides outside of manufacturing cost and having to design with the hole in mind ?