is it normal for 17 months old?

Hi mga momsh .. my nk experience n poh b s inio n parang sobrang aga madevelop ang skill ng baby.. ngulat kc aq 17 months plang baby ko memorize nia n ang alphabet at kilala nia tlga lahat ng letters ( tinry ko n xa s flash card to make sure) and nkk bilang n din xa 1 to10 pero wlang formal teaching .. ntuto poh xa s nursery ryhmes.. ngulat nlang aq n nkksabay n xa at memorize p... hndi poh b masama un .. ?? Ng aalala kc aq..