This pilot study will investigate the feasibility of physical activity tracking in patients aged 4-16 years before and after elective tonsillectomy as an innovative tool in paediatric research. The participating patients will receive a wearable physical activity tracker (CE-certified) that will continuously measure the patients' physical activity before and after an elective tonsillectomy, in addition to their parents' documentation of their child's activity in a conventional diary.

Inclusion Criteria:

• Age 4 to 16 years old, in 2 subgroups (4-7 years, 8-16 years)
• Inpatient surgery at University Children's Hospital Basel (UKBB), Switzerland
• Children undergoing an elective tonsillectomy or tonsillotomy. Children having additional ENT procedures, such as adenectomy, tympanostomy, etc. may be included as well.

Exclusion Criteria:

• Children with mental or physical impairment during daily-life activities.
• Children undergoing additional surgical procedures other than Ear, Nose & Throat (ENT) procedures impacting the recovery period.

Children undergoing elective tonsillectomy or tonsillotomy