Is the third leading cause of death for people ages 15-24.
a. suicide
b. alcohol
c. drug use
d. depression

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. 

True your body needs vitamins such as protein, vitamin d, fish oil etc