In mathematics education, learning trajectories have been provided from an early age to help educators identify and document children’s progressions in their mathematical understandings and thinking. This is different to identifying the mathematical thinking that may be evident in young, and very young, children, which focuses on determining the mathematics that the child may know rather than providing a consideration for how the child’s mathematical thinking is progressing (or if it is, indeed, progressing). This paper investigates whether Bishop’s (1988, 1991) six mathematical activities are evident in AERO’s Mathematical thinking early childhood learning trajectory.