“…In parts of Canada, surveillance has been enhanced by the use of broadband developmental screens, such as the Nipissing District Developmental Screen, 42 and other standardized approaches to documenting parental or clinician concerns. 43 Infants at high risk, such as siblings of children with ASD, should be monitored closely by their family doctor or pediatrician, and there should be a lower threshold for further assessment within primary care or by specialists. 4,16 Although a comprehensive review of screening for ASD is beyond the scope of this paper (for more detail, see Zwaigenbaum 18 ), two measures -the Modified Checklist for Autism in Toddlers (M-CHAT) 44 and the Infant-Toddler Checklist (ITC) 45 -have good psychometric properties for screening and are recommended for use.…”