5, but I don’t know if that is precocious, or was skewed by my persistent pointing out of every <span style = 'background-color: #dae8f4'>word</span>
, with sounding, I read to him, many books a day, from about 5 months and on. (I was determined to make him a good reader!) He did seem to memorizes the names of a lot (maybe 25) of his dinky cars right away (like Honda civic, Acura, BMW, etc), I think maybe by sound at first, but he was able to eventually read the names on the bottom. He loves cars, but never obsesses about them.