Toddlers’ body temperatures fluctuate throughout the day, and they can experience sudden fevers that parents may not immediately notice. That’s why Lego Fever was created to address this issue. Imagine taking your child and their toys to a public playground, and with Lego Fever, you can instantly check if any nearby children are running a fever. Reacting to toy-borne pathogens is the simplest way to prevent illnesses for your child.