Research on emergent autism spectrum disorder increasingly uses observational measures to investigate parenting of young children with or at elevated likelihood of autism. This systematic review analysed 21 papers narratively, including 13 unique 'coding approaches' and 63 parenting constructs. Through a comprehensive consensus decision-making process, parenting constructs were classified under nine overarching categories, identified based on prior categorisation: Warmth, Responsiveness, Scaffolding, Proactive Control, Intrusiveness, Negativity, Dyadic, Other, Multiple. We found a large heterogeneity in observational measures, and descriptions of parenting constructs lacked uniformity. The complex categorisation process demonstrates the need for a solid conceptual framework that can inform theory and practice. This review provides a first step, but further research should investigate applicability among young children of different ages.