Note what the child does with the toy.
Does this vary as the child gets older?
Does the child enjoy "ripping" it off a hard surface such as a hard floor or table top?
After a child has chewed on one of these, place it in a mild bleach solution and allow to air dry before making it available to another child.
Provide a plastic basket full of different, attractive chew toys. They come in a explore with fingers as well as gums.
The child will use small motor skills to explore small spaces.