Welcome to the Trisomy 18 International Patient Registry – a research database of families and children impacted by a trisomy 18 diagnosis – past, present and future. The purpose of this registry is to accelerate interest and investment in biomedical research to change how trisomy 18 is understood and treated so that fewer families lose their precious children to this condition in early life. The registry is developed with the generous support of friends and families to the Trisomy 18 Foundation.