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The early child period is considered to be the most important developmental phase throughout the lifespan.
Developmental milestones are behaviors or physical skills seen in infants and children as they grow and develop. Rolling over, crawling, walking, and talking are all considered milestones. The milestones are different for each age range. There is a normal range in which a child may reach each milestone. For example, walking may begin as early as 8 months in some children. Others walk as late as 18 months and it is still considered normal. One of the reasons for well-child visits to the health care provider in the early years is to follow your child's development. Most parents also watch for different milestones.