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The early child period is considered to be the most important developmental phase throughout the lifespan.
Critical Periods to Know. There are many specific physical, psychosocial (also called social/emotional or relating), and cognitive development milestones that most typically developing children go through. One of the earliest psychosocial critical periods is bonding. This happens in the newborn period. Holding, soothing, and caring for your baby makes it easy for her to move through this critical period. Another critical period involves the development of language skills. During the first two years of your childâs life it is important to provide a rich environment with regards to language.