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Your 9-month-old baby's growth and development - BabyCenter
Important Milestones: Your Baby By Nine Months | CDC
9-Month-Old Milestones: Developmental Milestones - Parents
9-Month-Old Baby: Development and Milestones - TheBump.com
Baby Development: Your 9-Month-Old - WebMD
9-Month-Old Baby: Developmental Milestones and Guidelines - Healthline
Your baby's developmental milestones at 9 months - UNICEF
Infant development: Milestones from 7 to 9 months - Mayo Clinic
9-Month-Old Baby: Milestones, Sleep, and Feeding - Pampers