r-e-d red!

yesterday i picked dean up from preschool and he said the usual things- what they had for snack, the shape they learned about that day, the color, the letter of the week. when we got home i gave the kids a snack and while dean sat at the counter eating he started singing "r-e-d red, r-e-d red, i can spell red, i can spell red. fire trucks are red, fire trucks are red. i can spell red. i can spell red." to the tune of frere jacques. i nearly cried... all 10 times he sang it that day. my baby... what is happening?!