I just love this concept! For the stacking bottles in particular, I'm wondering how you might be able to more visually differentiate the product information from the graphics for the child (letters, numbers, etc.). Without clear differentiation, the children may ignore the educational content entirely because it all may blend together as text to be ignored. Or have you found this not to be an issue?
What a wonderful and needed project. I'm wondering if any of the voice messages focus on the mother's health after the birth (physical as well as mental)? I'm not sure if this is outside of the scope of your focus, but I am curious if you saw a need for this type of information as well.