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André Bullinger maintained that the child’s sensorimotor development is deeply rooted in the many and complex interactions between sensory flows and deep-tonic sensations. Integration of these two components gives rise to a proprioceptive function, which he defined as a non-biological coordination that can be modified according to the interactions between the organism and its surroundings. Although sensory flows and deep-tonic sensations are independent from each other, their mutual integration can only occur in a context of active perception. This integration sustains the core concept of instrumentalization, which allows the transformation of a biological organism into a body. André Bullinger suggests that atypical development may originate in a disorder in the development of such instrumentalization. In atypical children, processing of sensory flows would favor what Bullinger defines as the archaic component of the effects of the signal on the body, an anomaly that would slow down the development of the instrumentalization of the body. The objective of this contribution is to examine the emergence of instrumentalization in premature infants through two functions: manual exploration and postural reaction to optic flows.