Conditioned and unconditioned reflexes
Conditioned and unconditioned (innate) reflexes underlie the behavior of each individual. The newborn has only unconditioned reflexes (sucking, defense, etc.), and conditional him begin to form at the end of the first month of life with the development of the spinal cord and subcortical brain regions.
Senses: sight, hearing, smell, touch and taste play an important role in the development of positive and negative conditioned reflexes in young children. As you know, they are peripheral parts of analyzers, transmitters in the central nervous system stimulation from the environment. Starting from the fifth month of life, all analyzers involved in the formation of the natural behavior of the child.