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Increased application of next generation sequencing has led to the discovery of a multitude of new neurodevelopmental syndromes, contributing to an increased diagnostic rate for exome sequencing from 25% originally to 40% currently. Owing to the recent recognition of these syndromes, as well as the types of large‐scale studies (with limited phenotype information) often making these discoveries, these disorders may be poorly characterized clinically. As a result there is very limited information and disorder‐specific support available to patients and families. We used a qualitative approach to explore how families experience a diagnosis of a new syndrome. We conducted semi‐structured telephone interviews with parents and adult siblings of children who received a diagnosis of a new syndrome after whole exome sequencing (WES) performed through a translational research study. The interviews were recorded, transcribed verbatim, and transcripts were analyzed using grounded theory methods. Analysis of the 12 interviews revealed that a lack of information about the child's condition continues to play a large role in these families' experiences even after diagnosis. Almost all (92%) participants expressed ongoing uncertainty about their child's health and future. Most (83%) participants were interested in identifying other families with the same syndrome, which was related to both social support and seeking of information. Interestingly, 33% of participants worried about the child's risk for cancer due to their syndrome. Our results highlight some of the needs of families of children with new syndromes, and emphasize important issues care providers should address in pre‐ and post‐test genetic counseling for WES and whole genome sequencing. [ABSTRACT FROM AUTHOR]