1. All living things must get rid of by-products that are not needed, like gases, liquids, or solids.

The best way is to swollow and hold in your breath

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other.