I'm in this boat. Every kid is different.

My oldest was reading little books by 3. It was zero effort other than reading to him. Suddenly he just took over and didn't need mom and dad to read to him anymore.

He's 8 now and can plow through the Harry Potter series in a week. Some days I think he might read better than I do at 31.

My youngest is 5 and still struggling. He never really liked to be read to. As soon as he could get up and do something else, he did. He's getting there though, and we'll get him there.