It's hard to say! My dad is the best detective where I'm from and I've ALWAYS wanted to be one too so I picked up clues and secrets and then I put them all together to solve crimes and mysteries. So riddles are basically a small mystery to solve. And now that I live with Caleb and Essek we have all sorts of riddles and puzzles because they like them too and it is very fun.
Do you read to your baby? You should read to your baby! Because then they learn how books work and that what is on the page has meaning and they learn vocabulary too.