I. Introduction
Over the recent years, there has been an increasing interest in social and physical infant-robot interaction, for the learning opportunities robots may offer if introduced in the early stages of human development [1]–[14]. Robots assessed for use in infant motor interventions, in particular, include humanoid robots to encourage kicking movements in infants while sitting [5], robotic overhead mobile systems to promote spontaneous movements in infants in supine position [9], ride-on robots utilized as body transport devices by infants to increase their open-area mobility [6], [11], [12], and small mobile and humanoid robots used in combination with other technology, such as body transport devices and harness systems, to con-currently ease biomechanical constraints and engage infants in chasing games [10], [15]. The robot operation protocols across these studies vary, posing interesting questions regarding the most efficient utilization of robots in their interaction with infants and emphasizing the need for further examination.