1 month daily routine program with weekly visits in natural environments (home, community, etc) together with WeFun-weareable to increase spontaneous use of the upper limb in children with UCP during activities of daily life and leisure. Activities are priorized by Canadian Occupational Performance Measure and Goal Atteinment Scale. Programs are designed together with a transdisciplinary team, acting as consultants. Children in the control group will not have experimental functions in their wearables.

Activity recorded across six axes of the accelerometer and gyroscope of the wearable will be combined and processed to obtained Upper Extremity Use (UEU) variable which will represent the quantity of upper extremity movement (mean activity counts per second over an entire monitored activity). This activity will be recorder during all the protocol (assessments and intervention period).

During AHA assessment, UEU will be extracted separately for both the dominant and non-dominant (or affected) hand and calculated an Asymmetry Index (AI) following the Edinburgh Inventory formula to check how much each arm contributes to the activity. This measurement will be recorded only at the laboratory assessments.

Grip strength is assessed with Biometrics E-LINK H-500 Hand Kit (dynamometer).

children performed three MVC with the grip dynamometer with each hand. After each MVC, a 30-s rest was provided. The mean of the three trials is used.

Assessed with Biometrics E-LINK H-500 Hand Kit (dynamometer).

Static motor fatigability will be measured during a 30-second sustained maximal contraction using the grip dynamometer. This measurement will be repeated three times.

Static motor fatigability will be quantified with 2 outcome measures: mean force (Fmean) and the static fatigue index. First, the peak force within the first 10 seconds was identified, and only the curve after this peak was used in the calculations.

For Fmean, the remaining time was divided into 3 equal parts, and Fmean was calculated for the first and last parts of the curve.

For the SFI, the part of the curve before the peak force was excluded from the calculation. Within the remaining curve, the area under the force-time curve and a hypothetical area under the force-time curve were calculated. The hypothetical area under the force-time curve mimics a situation in which strength would have been sustained at the maximum level during the trial and no

Assessed with Biometrics E-LINK H-500 Hand Kit (dynamometer).

Dynamic motor fatigability will be measured while the child had to squeeze repeatedly as hard and fast as possible during a 30-second period. The measurement will be successful if the child repeatedly squeezed over the entire 30 seconds regardless of the frequency (Brauers 2022). Three trials of this measurement will be performed.

Dynamic motor fatigability was quantified by Fmean and the number of peaks (Npeaks). The 30-second force-time curve was divided into 3 equal parts (10 seconds each), and Fmean and Npeaks were calculated for the first and third parts. A decrease in Fmean and/or a decrease in Npeaks between the first and third parts indicated higher motor fatigability.

Box and Block Test (BBT) will be used for measuring hand dexterity by using two compartment box containing 150 blocks. The test includes grasping, moving, and releasing wooden blocks from one side to the other. The score was recorded for 1 minute as the number of blocks passed over the wooden partition

Participation and Environment Measure (Young Children YC-PEM, for 3- to 5-year-old participants; Children PEM-CY, for-5 to 7-years-old participants) will be administered.

Young Children Participation and Environment Measure (YC-PEM)

The YC-PEM and PEMCY analyze the child's participation in different contexts, as well as the characteristics and resources of the environment and it´s implication on participation in children with or without disabilities. It´s a questionnaire, that families respond, and which also allows to know their desire of change, and different strategies they use to optimize the child's participation in their activities of daily life.

Scores are calculated for each setting through: 1) The average of all frequency ratings (range = 0-7) are used to calculate frequency; 2) The average of all involvement ratings (range = 1-5) are used to calculate level of involvement; 3) The number of items scored as "yes, change desired" are added, divided by the total number o

The Pediatric Quality of Life Inventory (PedsQL) cerebral palsy and multidimensional fatigue module, parental version is used.

It´s a questionnaire that assesses the quality of life of children from 2 to 18 years. It contains a specific module for children with cerebral palsy. Parents can make the report from 2 to 18 years and assessed the perceptions of parents about their children's HRQOL. The scale contains 35 items and covers aspects of daily activities, school, movement and balance, pain, fatigue, eating activities, speech and communication. The scientific literature relating to PedsQL supports the reliability, validity, and sensitivity of the PedsQL in children with cerebral palsy.

Teddy Bear Cancellation Test will be use to measure selective attention and hemineglect in children with unilateral cerebral palsy. A digital version of Teddy Bear is used to obtain more data of the assessment.

The Canadian Occupational Performance Measure (COPM) will be used to assess the children's self-perceived occupation performance over different categories, including self-care, leisure and productivity. The parents or caregiver rates performance and satisfaction for each functional goal on a ten point ordinal scale, where 1 = "not able to do it all"/"not satisfied at all" and 10 = "able to do it extremely well"/"extremely satisfied".

Goal attainment will be objectified using the Goal Attainment Scale (GAS) for at least two individualized therapy goals. The GAS enables the conversion of goal attainment on a 5-point scale into t-scores. The score for each functional outcome ranges from -3 to 2. The participant's baseline performance is represented by a score of -2. Improvements in functional goal performance correspond to scores ranging from -1 to +2, with score 0 being the expected outcome.

Subjective Usability Scale (SUS), a Likert-type scale with questions about effectiveness (can users achieve their objectives), efficiency (how much effort is expending in achieving the objectives) and satisfaction while using the WeFun-wearable.

In terms of adherence we will register number of weeks participating in the intervention, number and type of activities performed and possible dropouts. For checking acceptability and safety we will register parents´ answers some questions using a Likert-type scale.