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  1. CDC’s Developmental Milestones | CDC - Centers for Disease ...

  2. Child Development - Wiley Online Library

  3. Child Development | Child Development | CDC

  4. Child Development: Developmental Milestones, Stages & Delays

  5. Understanding the Stages of Child Development - Healthline

  6. Child Development - NAEYC

  7. Child Development - StatPearls - NCBI Bookshelf