Motor Milestones occur in a predictable developmental progression in young children.  They begin with reflexive movements that develop into voluntary movement patterns.  For the motor milestone of independent walking, there are many precursor reflexes that must first integrate and beginning movement patterns that must be learned.  Explain the motor progression of walking in a child, starting with the integration of primitive reflexes to the basic motor skills needed for a child to walk independently.  Discuss at which time frame each milestone occurs from birth to walking (12-18 months of age).  What are some reasons why a child could be delayed in walking?  At what age is a child considered delayed in walking and in need of intervention?  What interventions are available to children who are having difficulty walking?  Please be sure to use APA citations for all sources used to formulate your answers.