Answer:
I come without being fetched at night, hide away as soon as daylight strikes. Although I may look small, I am much mightier than what you can imagine. What am I?
My teeth help me suck.
I'm where yesterday follows today and tomorrow is in the middle. What am I?
Angels and pilots work with me.
Of the king I am blue and of the peasant I am red. Of the frog I am cold and of the dog I am hot instead. What am I?
No matter how little or how much you use me, you change me every month.