Reading by himself?

Today Jonah opened up his alphabet book to the "F" page...

     Big F, little f,

     what begins with f?

     Four fluffy feathers on a

     fiffer feffer feff.

...and immediately intoned, "Fah foh fah fff."

Coincidence?  I think not.  Besides, following that, he turned to the "B" page and said, "Buh buh bae bee."