Which of the following is not a way a mother passes an sti to her child? a. during pregnancy b. during delivery c. through breast-feeding d. through soiled diapers

D. because it only makes since because she cant do it through a diaper. 

I would say, D.through soiled diapers

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.