The new Canadian guidelines for FASD diagnosis (Cook et al “Fetal Alcohol Spectrum Disorder: A guideline for diagnosis across the lifespan, ” CMAJ2015) were published online in December 2015. These guidelines build on the original 2005 guidelines through an extensive review of the published evidence and consultation with clinicians across Canada. They include new recommendations for diagnostic terminology, expand the description of brain domains to be considered in assessment, provide additional recommendations on prenatal alcohol exposure, and broaden the considerations for diagnosing infants, young children, adolescents and adults.