During interactions with children, adults, most often unconsciously, change the way they perform their movements. The characteristics of such movements differ from the characteristics of movements present in interaction with another adult. In the literature they are referred to as child directed motiones or "motionese". Child-directed movements are characterized by slower movements, movements of increased scope and high frequency of the same movements. Infants have been shown to prefer child-directed movements more than adult-directed movements. Modifications involving the hands, body, and/or other objects when using child-directed movements are sufficient to attract attention in infants. Based on the above, the goal of this paper was defined, which wanted to examine the extent of child-directed movements in mother-child interaction in children of different chronological ages. We also wanted to examine whether there is a difference in the range of movements in mother-child interaction and interaction with an adult. Fourteen mothers of infants with normal development and without neurorisk factors participated in the study, who were divided into five groups depending on age (3-6, 6-9, 9-12, 12-18 and 18-24 months). In the second part of the research, 6 female adults participated, who were divided into pairs and demonstrated to each other the same test tasks that mothers demonstrate to their children. The research was carried out in the home of the child's family, where the examiners brought the necessary materials and recorded demonstrations of 5 test tasks (toys) by the mother towards the infant using video recordings. The adult demonstrations were filmed in the premises of the Faculty of Education and Rehabilitation in Zagreb. The results showed that the range of movement in the mother-child interaction is greater than the range of movement in the interaction between two adults. A significant difference in the range of movement, in mother-child interaction depending on the child's age, was not determined. This research examined an under-researched component of child-directed behavior that suggests that the extent of movement depends on who the object is demonstrated to. More specifically, the range of motion is greater in the interaction between mother and child compared to the range of motion in the interaction of two adults. No significant difference in the range of movements in the mother-child interaction, depending on the child's age, was proven, but differences were observed depending on the test tasks.