When photographing your children, get down on their level.
Eye to eye, lens level with their eyes.
By getting the lens down level with their eyes you are photographing them at a direct angle, the same way you photograph other adults. Shooting down on a child creates a perspective that is not always that flattering or interesting. You may spend some time down on your knees with them. But you’ll be much happier with your shot!
Then go even lower. Shoot up at them! Lay down and shoot from below their eyes. This will create a very unique perspective!
And of course all rules are made to be broken! Be creative and have fun!
Now go out and shoot.