"A B C...R 6 9"

We have been teaching Brenden the ABC's & he does really well, but he does like to mix it up a little. He gets all the way through G & then decides to throw in a different letter (which is usually R) & adds in a number or two (which is always 6 & 9). I'm not sure why! It's so cute though! He does get a lot of the letters right & in the order they're supposed to be. The letters at the end are W X Y J! lol Just in case anyone needed a refresher on the alphabet!