Understanding child development milestones is crucial for parents and caregivers to ensure that children are growing and developing as expected. These milestones are a set of skills or abilities that most children can do at a certain age range. They encompass physical, cognitive, social, and emotional development.

For example, a common milestone is the ability to walk, which typically occurs around 12-15 months of age. Another milestone is the development of language, with children typically saying their first words around 12 months and forming simple sentences by 24 months.

References:

• American Academy of Pediatrics. (2009). Caring for Your Baby and Young Child: Birth to Age 5. Bantam.
• CDC. (2021). "Milestones During Early and Middle Childhood." Centers for Disease Control and Prevention. https://www.cdc.gov/ncbddd/childdevelopment/positiveparenting/index.html