DevelopmentAge 18-24 monthsEvidence-based

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What Are Typical 18 to 24 Month Milestones?

Published February 10, 2026Updated February 10, 2026

Quick Answer

Typical 18 to 24 month milestones involve significant development across physical, cognitive, language, and social domains. During this period, children demonstrate increased mobility, language skills, and social interactions.

Key Takeaways

  • Typical 18 to 24 month milestones involve significant development across physical, cognitive, language, and social domains. During this period, children demonstrate increased mobility, language skills, and social interactions.
  • Evidence shows that by 24 months, children can typically say about 50 words and combine two words into simple phrases, according to the American Academy of Pediatrics (AAP).
  • The CDC recommends that children at this age engage in daily physical activity for at least 30 minutes to support gross motor development.
  • Studies indicate that by 18 months, most children can walk independently and may start running, according to the World Health Organization (WHO).
  • Research shows that children can follow simple directions by 24 months, indicating cognitive development, as reported by the AAP.
  • WHO guidelines suggest that children should exhibit social behaviors such as playing alongside peers by 24 months.

Quick Answer

Typical 18 to 24 month milestones involve significant development across physical, cognitive, language, and social domains. During this period, children demonstrate increased mobility, language skills, and social interactions.

What You Need to Know

The 18 to 24 month age range is a dynamic period of growth and development for toddlers. During this time, children typically achieve important milestones that lay the foundation for future learning and social interactions. Parents and caregivers can support this development by understanding what to expect and engaging with their child through play and communication.

Evidence-Based Guidelines

According to the American Academy of Pediatrics (AAP), developmental milestones can be categorized into four domains: physical, cognitive, language, and social. Each of these domains has specific indicators that can help parents track their child's growth.

  • Physical Development: By 18 months, children typically walk independently and may begin to run. By 24 months, many children can climb stairs with assistance and kick a ball, according to the CDC.
  • Cognitive Development: By 24 months, children can follow simple instructions and engage in problem-solving activities. The AAP highlights that toddlers should be able to point to objects or pictures when they are named.
  • Language Development: Children at this age typically say about 50 words and start combining them into two-word phrases. Research indicates that language exposure through reading and conversation is critical for development.
  • Social Development: Children begin to show interest in other kids and may engage in parallel play, where they play alongside peers. WHO guidelines suggest that social interactions are crucial for emotional development.

Common Questions Parents Ask

As children approach 18 to 24 months, parents often have questions about their child's development. Understanding typical milestones can ease concerns and promote positive parenting practices.

Safety Considerations

While monitoring developmental milestones, it is essential to maintain a safe environment for toddlers. Parents should ensure that their homes are child-proofed to prevent accidents as children become more mobile. Common safety measures include securing furniture, using safety gates, and keeping hazardous materials out of reach.

When to Contact Your Pediatrician

If you notice any of the following developmental delays, it is crucial to consult your pediatrician:

  • If your child is not walking by 18 months.
  • If your child does not have at least 15 words by 18 months or 50 words by 24 months.
  • If your child shows little interest in social interactions.
  • If you have concerns about your child's hearing or vision.

The Bottom Line

Understanding developmental milestones between 18 and 24 months can help parents support their child's growth effectively. Engaging in interactive play, reading, and providing a safe environment are essential components in promoting healthy development. If there are any concerns about your child's progress, consulting with a healthcare provider is recommended.

Frequently Asked Questions

What language skills should my child have by 24 months?

By 24 months, most children can say around 50 words and start to combine words into simple sentences. The AAP notes that this is a crucial period for language development, and parents should encourage communication.

How much physical activity do toddlers need?

The CDC recommends that toddlers engage in at least 30 minutes of structured physical activity each day, along with several hours of unstructured play, to promote healthy physical development.

What social skills should my toddler be developing?

By 24 months, children typically show interest in other children and may engage in parallel play, where they play alongside peers. This is a key milestone in social development according to WHO guidelines.

When should I be concerned about my child's development?

If your child is not exhibiting the typical milestones, such as not walking by 18 months or not saying any words by 24 months, it's important to consult a pediatrician for further evaluation, as recommended by the AAP.

How can I support my child's development during this stage?

Engaging in interactive play, reading together, and encouraging exploration are effective ways to support your child's cognitive and social development. The CDC emphasizes the importance of active participation in your child's learning.

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💡 Note: This content is curated from official health organization guidelines. For original source citations, see the "Sources" section above.

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Medical Disclaimer

This content is educational and does not replace professional medical advice. Always consult your pediatrician for personal health concerns.

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