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Ages & Stages

Ages and Stages

Developmental Milestones

Developmental milestones are the things most children can do by a certain age. While all children develop differently, it helps to know if your child is meeting typical milestones and how you can support their healthy development. How your child plays, learns, speaks, acts and moves offers important clues about your child’s development.

Below are materials to help you understand what’s happening at different stages of your child’s life and how you can help them learn and grow.


infant stages header

Your Baby at 2 Months        Su Bebé a los 2 Meses
Your Baby at 4 Months        Su Bebé a los 4 Meses
Your Baby at 6 Months        Su Bebé a los 6 Meses
Your Baby at 9 Months        Su Bebé a los 9 Meses

Toddlers stages header

Your Child at 1 Year              Su Hijo de 1 Año
Your Child at 18 Months      Su Hijo de 18 Meses
Your Child at 2 Years            Su Hijo de 2 Años

preschooler stages header

Your Child at 3 Years            Su Hijo de 3 Años
Your Child at 4 Years            Su Hijo de 4 Años
Your Child at 5 Years            Su Hijo de 5 Años



Arizona’s Infant and Toddler Developmental Guidelines

First Things First and other key partners in Arizona’s early childhood system developed this detailed resource to help parents, families and other caregivers understand the appropriate development of children from birth to age 3, and also what they can do to support children’s healthy development and learning.

Recognizing that all children progress differently, these guidelines describe expectations about what infants and toddlers should know (understand) and do (competencies and skills) across the full range of development:

  • Social and emotional development, which includes trust, self-regulation, and relationships with other children
  • Approaches to learning, which includes persistence, curiosity, creativity, and problem solving
  • Language development and communication, which includes listening and understanding, speaking, and literacy
  • Cognitive development, which includes exploration, memory, and play
  • Physical and motor development

The guidelines also explain what adults can do to support children’s optimal learning and development. For example:

example of adult guidelines

Download the Guidelines

More Online Resources About Child Development

  • – the skills and behaviors you can expect from your baby at every stage from birth to 3
  • – more on developmental stages from the American Academy of Pediatrics
  • – a child development tracker for insights on the stages of growth, from PBS Parents

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