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  1. Infant development: Birth to 3 months - Mayo Clinic

  2. Newborn baby: Development, milestones & growth - BabyCenter

  3. Newborn Development: 0-1 month - Children's Hospital of …

  4. Newborn Age Range: How Long Is the Newborn Stage? - TheBump.com

  5. The Newborn Stage: What Is It? And When Does It End? - New Baby

  6. Baby Development Stages: The First Year - WebMD

  7. A Week-by-Week Guide to Your Baby's First Year Milestones - Parents

  8. Baby Development Stages in the First Year: Month by Month - Healthline

  9. How Long is the Newborn Stage? A Quick Guide for New Parents

  10. When Does the Newborn Stage End? A guide from a pediatrician