Getting Older

(On the way home from school today)
Kellen: I like babies.
Mommy: Ok, tell me why.
Kellen: Tatum makes me laugh.
Mommy: You know what, buddy? You make her laugh, too...lots!
Kellen: I know. She's not getting older.
Mommy (sighing): Unfortunately, Tatum is getting older and so are you. Remember, her birthday party is this weekend.
Kellen: I just already KNOW that! (Pause) You're getting older, too Mommy.
Mommy: Thanks, Kellen.