Triplegia affects three limbs. The most common pattern is for both legs and one arm to be affected. It is sometimes thought of as hemiplegia overlapping with diplegia, because the primary motor difficulty is with the legs. The guidelines and recommendations pertaining to diplegia may offer the most useful information.
If all three limbs are severely impaired, resources for children with quadriplegia would probably be the most beneficial. This type of cerebral palsy is thought of as quadriplegia with less severe involvement of one of the arms.