Most of us are used to viewing the world from our own perspective. Wherever we go, we tend to see our surroundings from one height. However, that may differ from our characters!
In the case of a child, the height difference may be great. Get down on your knees and look around the room. Quite a change isn't it? You no longer look down on most objects. Counters and table tops may be at eye level. You no longer stare at the roof of the car - you stare at the taillight.
Twelve inches can make a big difference in terms of perspective, too. While someone 6'3" may have a clear view of the scene, a person who's only 5'3" will not see it so clearly.
Consider viewpoint when your characters change position, too. Bending over, kneeling, lying down - these all offer different viewpoints.
Do you remember to alter perspective when writing from a character shorter or taller than you?
Remember to place objects where your character would naturally see them - but only if you want to suffer the consequences!