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The early child period is considered to be the most important developmental phase throughout the lifespan.
Developmental Delay Overview. Children reach developmental milestones at their own pace. Minor, temporary delays are usually no cause for alarm. An ongoing delay or multiple delays in reaching milestones is called developmental delay. Developmental milestones include language, thinking, and motor skills. Developmental delay may be caused by a variety of factors, including heredity, problems with pregnancy, and premature birth.