This may be the coolest onesie ever. At first glance, it's just a regular blue or pink outfit. However, the color of the onesie changes based on your baby's temperature. If your child has a high temperature, the BabyGlow Temperature Changing Bodysuit turns white to let you know your baby needs care and medicine. This cotton bodysuit is comfy for the baby and practical for new parents. With all those nightly feedings you'll be doing, you can check up on the progress of the fever through the night just by looking at the color of the suit. The bodysuit turns white when it detects body temperature is higher than 98.6 degrees. As an added bonus, it's safe for machine wash. Not bad for a piece of cotton!