Points

List down the negative aspects of cardboard materials

How to overcome the negative or the poor material aspects of cardboard
Construction of full scale mock ups to test on the durability of the material
Using less of the planer surface for the function but experiment on the edges and the sides of the cardboard as a form of a function
as it will be more nice and interesting.
The basic design was a bit too utilitarian in a way that the design is too obvious for its function
The safety aspect of the design
Consider the sharp edges of my product as cardboard pieces are processed and pieced in a way that leaves the edges fine and sharp
To make use of more folds other than raw edge cuts to soften the edges in my designs
To mix materials
Maybe could wrap cloth or fabric material around cardboard to enhance the design and manage the safety issues
The play of colours
What will happen if the kid bites the products