1. The accuracy of the sensors (Flash vs Enlite glucose monitoring) will be evaluated with a standardized breakfast test. Patients receive a standardized breakfast. The usual insulin bolus will be administered at breakfast. After breakfast, a venous blood sample is taken for 2 hours every 15 minutes to determine the blood sugar. At the same time, the glucose value shown by the sensors will be noted. A comparison of the blood glucose value with the data recorded by the sensor can evaluate the accuracy of the sensor and also estimate the lag-time between the sensor glucose and the venous glucose.
2. Patient satisfaction will be evaluated using a questionnaire that will be completed after the Enlite sensor has been worn for 1 month.
3. The development of skin reactions will be checked by a short questionnaire, supplemented with a picture of possible skin phenomena.
4. The data recorded by the FreeStyle sensor (average glucose,% above target,% within target,% under target, amount of hypoglycemia) in the month prior to sensor switching will be compared to the same data recorded by the Enlite sensor during the first month of use.

Inclusion Criteria:

• Children (5 to 18 years)
• Diagnosis of type 1 diabetes mellitus
• Treatment is an insulin pump and wearing a FreeStyle Flash Libre glucosesensor

Exclusion Criteria:

-

Children (5 to 18 years) with type 1 diabetes mellitus treated with an insulin pump and wearing a FreeStyle Flash Libre glucosesensor