 Outcome measures will be performed pre-, post- and 1 month post-intervention, by an assessor blinded to group allocation. The primary outcome measure will be the Function in Sitting Test. Secondary outcome measures will be: Ottawa Sitting Scale, Reaching Performance Scale, Wolf Motor Function Test and quantitative measures of postural control performed in sitting. Two-way analyses of variance factors: time pre-, post-, 1 month post-and groupexperimental, control and Tukeys post-hoc analyses will be used to test the effect of VRT on the outcome measures. 