* Heat Discoloration spoon set is designed especially for baby.  * Expert said the adult's temperature sensing is few higher than baby's, suitable temperature for baby is 30-40 centi degree. If use adults mouth to test the food temperature which is not healthy and not exactly. When you use this spoon to feed baby, if the foods temperature higher than 40 centi degree, the spoon tip's rim will change to white, if the foods temperature is suitable, the spoon color will regain. BPA FREE