Because the movie Babies only shows the first years of life. This stage focuses on the fact that infants have limited knowledge of their world. They must use the skills they were born with to gather facts and information about the environment. These skills include looking, sucking, grasping, listening and any other reflexes. In the sensorimotor stages, infants acquire knowledge through sensory experiences and manipulation of objects (Cherry, Piaget's Stages of Cognitive Theory Development). This stage is also divided into six substages: reflexes, primary circular reactions, secondary circular reactions, coordination of reactions, tertiary circular reactions, and early representational thinking. Object permanence is one of the achievements of this stage of development. Object permanence is when an object continues to exist even though you cannot see or hear it. We can see this stage developing in all of these babies. One thing I noticed was when Bayarijargal first saw his feet. He couldn't stop touching them. He wanted to put them in his mouth. For a child at this stage of life, they understand their environment through reflexes such as putting objects in their mouth. Ponijao does the same thing when we see her throwing stones and sticks at him