A baby is born with a program of primitive reflex movement which allows the child to develop orderly from one stage of development to the next. Each stage requires the previous stages reflexes to be inhibited so that progressive learning & development can occur http://www.solutionsforpainandhealth.com.au/movement-cognitive-function/.
As the primitive reflexes move the baby through the stages of development the Nervous System matures. Different senses & parts of the Nervous System communicate with each other allowing the babys tasks to become more skilled. Early primitive reflexes are inhibited and others emerge as the nervous system develops and matures. (It is now known that throughout life the structure of the brain adapts to the use it is put to – this is called neuroplasticity).
For example: when the babys vision allows it to gaze at an object it will reach which will then lead to a roll onto the stomach. Once on the stomach the baby will explore & move around, initially pivoting on its stomach then it will creep (using the same arm & leg) , crawl (using the opposite arm & leg). Then it will pull itself up to stand walk then run.
These initial programmed reflexes launch the baby into neurological development. Where the primitive reflexes do not inhibit, the babys nervous system development into more sophisticated function may be hindered. For example, if the muscles of the eye do not allow one to work with the other the childs visual perception will be affected with potential learning ramifications. Likewise, if a child does not perceive sounds properly this can lead to problems with development & learning.