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The early child period is considered to be the most important developmental phase throughout the lifespan.
âChild developmentâ is a term used to define a childâs progression and describe how they become able to perform certain tasks and develop functional skills as they grow older. 1  Birth to 3 Months. 2  3 to 6 Months. 3  6 to 9 Months.  9 to 12 1  Months. 1 to 2 Years.  2 to 3 1  Years. 3 to 4 2  Years. 4 to 5  Years.