Baby recognizes different books

We started reading korean books to my son when he was around 5 months,he’s turning 1 soon. Sometimes parang interested sya but most of the time dedma lang. He has this book about a sheep who has a ticklish nose that I always read since yun lang yung korean story book na pinaka easy for me ba basahin. Kanina while we were playing,he suddenly sneezed. I remembered the line in the book na napasneeze bigla yung sheep and sinabi ko sya out loud. My son suddenly went to the bookshelf,took the exact book out and gave it to me. Nagulat ako. I tried asking for another book to see if he really recognizes his books. Lo and behold,he picked the right book that I asked. Nakakatuwa lang and shook ako. I didn’t expect na talaga palang nakaka intindi na ang babies. Hindi din kasi ako ganito katutok nun sa panganay ko and my panganay is 9yrs old na so parang newbie uli ako with babies?. By the way,I talk to him in TagLish and konteng korean.