"It's better for a child to tell the toy what to do than for the toy to tell the child."
The same pediatrician (one Deborah James) is quoted at the end of the article, too:
"In her office last week, James says, 'A 9-month-old had the time of her life playing with the exam table paper.' She learned about cause and effect (crinkling caused a noise); trial and error (gentle crinkles made a less satisfying sound); constancy (crinkling produces some noise every time); and limits: Mom said 'No,' every time it went in her mouth.
"'Now that's an educational toy,' James says."