There are several monitors that attach to the infant on this list because these are seen as some of the best devices available online currently. Most of these attach by means of a button-type device that fastens to the clothes or diaper of the baby. They track movement, heart rate, and oxygen levels of the child and when the child is not breathing for about fifteen seconds. One of these devices is a sock that is worn by the baby to track these statistics that are reported to the parent’s phone. They are all safe to use and pose no safety hazards for the child when worn.