Possibly but my husband and I were both reading well by age 3 and my 2.25 year old can sight read dick and Jane and Dr Seuss books.
Having a 4 year old read 100 books in one day is a publicity stunt.
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I watched him reading some books. It was horribly tedious, so I gave up watching. I question the number of books read. The video I skimmed over was almost 3 hours IIRC. Would not be surprised if the parents planned this to go on Steve Harvey’s or Ellen’s show.