The role of Physiotherapy in Down's syndrome is mainly education for the parents. Down's patients are often hypermobile and present with widespread low tone. By educating parents at an early age they are able to adapt daily activities such as playing to benefit the child more by strengthening muscles and helping to increase tone with increasing coordination and. As the child gets older, muscle imbalance may cause problems executing gross and fine motor tasks which can be adressed using exercises etc. It is important to realise that physiotherapy will need to be combined with other members from different health professions so a multi disciplinary approach is necessary. The combined approach will not "cure" the disorder but will enable to patient to be as able as possible. This is only a general overview as I'm not specialised in paeds or neuro. Maybe someone more experienced in the area may like to expand more.