DevelopmentAge 0-12 monthsEvidence-based

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When Should I Expect Baby Development Stages?

Published February 13, 2026Updated February 13, 2026

Quick Answer

Baby development stages require tracking growth, motor skills, and social engagement. Expect key milestones at 2, 4, 6, 9, and 12 months.

Key Takeaways

  • Baby development stages require tracking growth, motor skills, and social engagement. Expect key milestones at 2, 4, 6, 9, and 12 months.
  • Evidence shows that by 2 months, babies should begin to smile socially and follow moving objects with their eyes - according to the AAP.
  • The CDC recommends regular developmental screenings at 9 and 18 months to identify potential delays.
  • Studies indicate that by 6 months, infants should be able to roll over and sit with support - as noted in WHO guidelines.
  • According to the AAP, by 12 months, babies typically can say a few words and may take their first steps.
  • WHO guidelines suggest that parents engage in interactive play to support cognitive and social skills as early as 3 months.
  • Research published by the CDC shows that early intervention can significantly improve long-term outcomes for children with developmental delays.

Quick Answer

Baby development stages require tracking growth, motor skills, and social engagement. Expect key milestones at 2, 4, 6, 9, and 12 months.

What You Need to Know

Understanding baby development stages is essential for parents and caregivers. The first year of life is marked by significant growth in physical, cognitive, and social domains. The Centers for Disease Control and Prevention (CDC), the American Academy of Pediatrics (AAP), and the World Health Organization (WHO) provide guidelines to help parents monitor their child's development effectively.

Evidence-Based Guidelines

According to the AAP, regular check-ups are crucial to assess developmental milestones. Here are some key recommendations:

  • By 2 months, infants should start smiling socially and tracking objects with their eyes.
  • At 4 months, babies typically can hold their head up and may begin to babble.
  • By 6 months, babies should be able to roll over and sit with support, as outlined by WHO guidelines.
  • At 9 months, infants often start crawling and can respond to their name.
  • By 12 months, babies should be able to say a few words and may begin walking.

The CDC recommends routine developmental screenings at 9 and 18 months to catch potential delays early. Studies show that early intervention can significantly improve long-term outcomes for children with developmental delays.

Step-by-Step Guide

  1. Track Developmental Milestones

    Regularly observe and note your baby's achievements in areas like motor skills, communication, and social interaction.

  2. Engage in Play

    Participate in age-appropriate play to stimulate cognitive and physical development, as recommended by WHO.

  3. Consult Your Pediatrician

    If you have concerns about your baby's development, schedule a check-up for professional assessment and guidance.

Common Questions Parents Ask

Parents often have concerns about their child's development. Common questions include:

  • What are the key developmental milestones for babies? Key milestones include smiling at 2 months, sitting up by 6 months, and saying simple words by 12 months, according to the AAP.
  • When should I be concerned about my baby's development? If your baby is not meeting key milestones, such as not rolling over by 6 months or not making sounds by 4 months, you should consult your pediatrician.
  • How can I support my baby's development? Engage in activities like talking, singing, and playing interactive games, which the CDC recommends to promote motor and cognitive skills.
  • What should I do if my baby misses a milestone? If your baby misses a developmental milestone, contact your healthcare provider for advice and possible screenings, as early intervention is crucial.
  • At what age do babies typically start crawling? Most babies start crawling between 6 to 10 months, according to AAP guidelines. Each child develops at their own pace, so variations are normal.

Safety Considerations

It is important to remember that each child develops at their own pace, and some variability is normal. However, delays in reaching significant milestones may require further evaluation. The CDC advises that parents should not hesitate to reach out to healthcare providers if they have any concerns about their child's development.

When to Contact Your Pediatrician

Parents should seek medical advice if they notice any of the following:

  • Your baby is not smiling by 2 months.
  • Your baby does not babble by 4 months.
  • Your baby is not rolling over by 6 months.
  • Your baby cannot sit without support by 9 months.
  • Your baby does not say a single word by 12 months.

The Bottom Line

The first year of your child's life is crucial for development, with key milestones occurring at various stages. According to the AAP and CDC, being proactive in monitoring these milestones can help ensure your child receives the support they need for healthy growth. Remember that early intervention can lead to better outcomes in the long run.

Frequently Asked Questions

What are the key developmental milestones for babies?

Key milestones include smiling at 2 months, sitting up by 6 months, and saying simple words by 12 months, according to the AAP.

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

If your baby is not meeting key milestones, such as not rolling over by 6 months or not making sounds by 4 months, you should consult your pediatrician.

How can I support my baby's development?

Engage in activities like talking, singing, and playing interactive games, which the CDC recommends to promote motor and cognitive skills.

What should I do if my baby misses a milestone?

If your baby misses a developmental milestone, contact your healthcare provider for advice and possible screenings, as early intervention is crucial.

At what age do babies typically start crawling?

Most babies start crawling between 6 to 10 months, according to AAP guidelines. Each child develops at their own pace, so variations are normal.

Step-by-Step Guide

1

Track Developmental Milestones

Regularly observe and note your baby's achievements in areas like motor skills, communication, and social interaction.

2

Engage in Play

Participate in age-appropriate play to stimulate cognitive and physical development, as recommended by WHO.

3

Consult Your Pediatrician

If you have concerns about your baby's development, schedule a check-up for professional assessment and guidance.

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

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