Flowchart time 0: obtaining ICF, signed by both parents, placing of probe, explanation of questionnaires, completing SF36 and satisfaction scale time 6: FLACC time 12: FLACC time 18: FLACC time 24: FLACC, satisfaction scale, reading out pH monitoring from the first 24 hours, then starting of Gaviscon in function of the result. The Gaviscon is supplied by the service, at no cost to the patient time 30: FLACC time 36: FLACC time 42: FLACC time 48: FLACC, satisfaction scale, remove pH monitoring