The goal of this clinical trial is to compare combination therapy with low volume trans anal irrigation (TAI) and oral laxatives to monotherapy with oral laxatives in children with functional constipation and fecal incontinence. The main questions it aims to answer are: * Can more efficient treatment be achieved with aforementioned combination therapy? * Does the well-being of the children change, when they are well treated for their symptoms? * Is low-volume trans anal irrigation a tolerable treatment method for children? Participants will be randomized into 2 groups, where one group is treated with current standard treatment of PEG (oral laxatives), and the other group is treated with PEG + daily low volume TAI.
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Fecal incontinence episodes
Timeframe: 6 weeks