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The early child period is considered to be the most important developmental phase throughout the lifespan.
Your Baby's Developmental Milestones. Find out when your baby might walk, talk, crawl, grasp objects, and hit other fantastic firsts from birth to 6 months and 7 to 12 months. Plus, learn when other babies reached their milestones, and discover new Wow!-worthy development facts. Articles (25). 1  Your child's size and growth timeline.