H.H.
Hi, M. --
Kids are each so individual! I don't personally think you should worry at your son's young age. One of my girlfriends didn't even let her children watch tv until they were over a year old. In our case, my daughter would have massive freak-outs that could only seem to be calmed by something electronic, like a tv or a cell phone. At the same age, she had absolutely no attention span for books.
At some point by around 15 months, suddenly, everything changed, and she LOVED books. Before she even turned 3, we started reading her books like Anne of Green Gables or Hans Brinker and the Silver Skates, and she was totally into it. She'd even talk about the characters and her favorite parts and she'd be excited to read the next installment at bedtime. Now she's 3, and she's already reading.
So, just roll with it. Keep providing exposure to the materials you think will be beneficial for your son, and I'll bet he'll catch on to the enjoyment of them in the next 6-12 months.
:) Good luck!
H.