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The early child period is considered to be the most important developmental phase throughout the lifespan.
Child development is a process every child goes through. This process involves learning and mastering skills like sitting, walking, talking, skipping, and tying shoes. Children learn these skills, called developmental milestones, during predictable time periods. Children develop skills in five main areas of development: 1  Cognitive Development. This is the child's ability to learn and solve problems. 2  Social and Emotional Development. This is the child's ability to interact with others, including helping themselves and self-control. 3  Speech and Language Development.