The first thing we must know is parents; things will happen outside our control. That's ok, in the five keys to parenting. That means you are in the game.
The second step is to notice; both what comes up in you and what comes up within your child.
This one is a little harder than it sounds, but with practice it will come naturally. You'll be able to notice when your child is having a bad day, or when they're just ready for something new and exciting.
Give this one a listen to and notice if you start noticing more. Haha, see what I did there—noticing/ noticing.