You think you're singing---there's a melody, the words, some sort of pattern----However you look at it or think about it, that's singing. There you are, tapping into one of the very things that makes you human.
Children do this so naturally. I think even if they've never heard another soul singing, children will sing. One parent told me recently that her child is singing in sentences before she's actually talking.
And when you sing with your child, you're doing so much more than simply sustaining notes and sticking in words. You're communicating in vital, empowering, meaningful ways.