Generally looking at things and hearing words is pretty hard to stop if he's being raised as a human. Reading is a good way to be sure to get a good dose but certainly not the only way.
In my opinion the value of reading has two main parts; forming a habit of valuing books, and much more importantly setting aside time to get close and use words. For the later it doesn't have to be reading. Chat with him, gossip about your work, the news, the neighbors, anything at all. And for the former People is about as good as anything at one year old.
The habit of books is hoped to last a lifetime, so a few months off the front isn't that big a deal. The trick to forming any habit isn't starting early it's being consistent and making it enjoyable.