In in my own totally biased unscientific experience, narrow calcs with relatively wide forefeet making footwear fitting realllllly fun and probs with pre fabricated device fitting
Should anyone be interested in further reading on the podiatric involvement in Down syndrome:
Caselli MA.
(2003)
Biomechanical management of children and adolescents with Down syndrome: proper diagnosis of biomechanical abnormalities allows for more effective treatment of this condition.
Podiatry Management.
Issue:
April-May.
Selby-Silverstein L, Hillstrom HJ & Palisano RJ.
(2001)
The effect of foot orthoses on standing foot posture and gait of young children with Down syndrome.
NeuroRehabiliation.
Vol. 16, pp. 183 – 193.