When applying a thermometer to a child, measure under the armpit for about 5 minutes. When using the thermometer, pay attention to the following points: 1, before use to make the mercury scale below 35 ℃ below. 2, to ensure that the mercury end clamped in the baby’s armpit, in order to read the correct number. 3, in the application of the thermometer, the adult should be supervised beside the child, so as to avoid accidents such as puncture or accidental ingestion of mercury due to the thermometer broken. 4, in the readings, the thermometer should be in a horizontal position to correctly read the number, rather than to take a 5, in the use of thermometer before and after the use of alcohol thermometer sterilization. 6, if the test temperature is greater than 38.5 ℃, should be timely application of antipyretic drugs, application of antipyretic drugs should be timely to take the baby to the hospital.