Kids physically develop at slightly different rates. There are, however, milestones to watch for at certain ages. Keeping track of children's progress in physical coordination at different ages can help reveal potential issues in the school setting.
As the number of non-integrated primary infant reflexes increase in an individual, the range and severity of motor, communication, and cognitive challenges and emotional and behavioral regulation issues correspondingly increase.
Primitive Reflex Article- This link provides information about the primitive motor reflexes and disorders. This is a great tool for fieldwork because it provides exercise ideas in order to break motor patterns.