Last updated 4 April 2016 Little People of NZ - Families of Little People, and Other People Interested in Their Welfare. Many Conditions and Syndromes May Cause Dwarfism. Little Person Defined as Height at Maturity Does Not Exceed 1.47 metres National Marfan Foundation (USA) New Zealand Down Syndrome Association Prader-Willi Syndrome Association of New Zealand Unique - Inform, Support and Alleviate the Isolation of Anyone Affected by a Rare Chromosome Disorder and to Raise Public Awareness (UK) Rett Syndrome New Zealand Turner Syndrome Support Group NZ New Zealand Williams Syndrome Association