Not in my experience; it just changes course and proceeds in a more stepwise fashion, with larger, discrete appearances of content apparently mastered. For instance, DS hasn't been exposed to much math other than basic counting and numbers. We showed him a 5 minute Brain Pop Jr video on place value last week and he completely internalized it. (I know this because he was talking about it fluently in his sleep.)
What you may see over the next few months is a shift in gears from learning basic literacy/numeracy to content areas of interest. I found the 2-3 year coincided with DS' burgeoning interest in life sciences (esp. immunology and hematology) and philosophy. For this reason, I'd urge you to get out and get active in your community and read widely together, to offer him a wide array of interests to choose from.
Good luck! That age can be exhausting but also tremendously enjoyable.
