In sequential actions, posture plans are reused to reduce planning cost. The present study investigated whether this cost optimization principle, termed motor hysteresis, is already established at an early developmental stage. To this end, 22 preschool children (mean age=5.1a, 11 males) were tested in a sequential reaching task: opening a column of slotted drawers, once in an ascending and once in a descending order. The selected posture (over- vs underhand grasp) was documented for each drawer and order. If motor hysteresis existed in preschool children, a persistence in the previous posture was expected. A GLMM with a logistic link function, fixed effects for ‘order’ and ‘drawer height’, and a random effect for ‘subject id’ showed a main effect of ‘drawer height’, z = 6.468, p < .001, R²_β* = .005, indicating that children used an underhand grasp for the lower and an overhand grasp for the higher drawers. More importantly, the GLMM showed a main effect for ‘order’, z = 3.363, p < .001, R²_β* = .001: The children persisted in an overhand posture in the descending and in an underhand posture in the ascending sequences. These findings show that children adapt their grasp posture to height, but persist in a former posture in a sequential reaching task. The fact that motor hysteresis is already established at such an early developmental stage emphasizes its importance as a cost optimization principle for motor planning and is consistent with the results demonstrated in adults.