Agnieszka, Mary's right, Triple X does not cause T-18 as they involve totally separate chromosomes!!! Name: XXX syndrome (also called Triple X syndrome, x Trisomy & 47xxx http://www.med.umich.edu/1libr/yourchild/xxxsyn.htm Fawna, mom to Philina 23 yrs (PT6p & Moya Moya Syndrome) Research Coordinator: Tracking Rare Incidence Syndromes (TRIS) project - We are currently enrolling all varieties of rare trisomy, living & deceased, for the main project database. To include your child's data and help update the medical literature please see: http://web.coehs.siu.edu/Grants/TRIS/ And to add a link for your Trisomy child's personal web page please see: http://www.livingwithtrisomy.org/ Building ___ooOOoo__ Rainbows www.trisomyonline.org Families Helping Families On-line