I have made some simple toys for a young child from bamboo stems
culled from a little grove I have been growing for about 8 yrs,

The biggest stems I have used are about 0.25" (12 mm) in diameter.

The bamboo I have used is phyllostachis aureosulcata.

Any known toxity if a child chews the bamboo?

I have found none thus far.

Swallowing appears impossible as I have kept my long dimmension
of the order of 5" (15 cm).