DevelopmentAge 0-12 monthsEvidence-based

Insight

What Are the Stages of Baby Development?

Published January 22, 2026Updated January 22, 2026

Quick Answer

The stages of baby development involve physical, cognitive, and emotional growth that occur from birth through 12 months of age. These stages include milestones such as rolling over, sitting up, and first words, guided by official guidelines from the CDC, AAP, and WHO.

Key Takeaways

  • The stages of baby development involve physical, cognitive, and emotional growth that occur from birth through 12 months of age. These stages include milestones such as rolling over, sitting up, and first words, guided by official guidelines from the CDC, AAP, and WHO.
  • The AAP outlines that babies typically begin to roll over around 4 months.
  • CDC guidelines highlight that most infants can sit without support by 6 months.
  • WHO guidelines suggest introducing solid foods at around 6 months of age.
  • Evidence shows that babies generally start to crawl between 6 and 10 months.
  • Research indicates that first words are often spoken around 12 months.
  • According to the CDC, babies should have regular check-ups to monitor development.

Quick Answer

The stages of baby development involve physical, cognitive, and emotional growth that occur from birth through 12 months of age. These stages include milestones such as rolling over, sitting up, and first words, guided by official guidelines from the CDC, AAP, and WHO.

What You Need to Know

Understanding the stages of baby development is crucial for new parents. Each baby develops at their own pace, but there are general milestones that most infants reach within the first year. According to the American Academy of Pediatrics (AAP), these stages include physical, cognitive, and emotional development. Recognizing these stages can help parents provide the necessary support and seek timely medical advice if needed.

Evidence-Based Guidelines

According to the Centers for Disease Control and Prevention (CDC), babies typically start to roll over at around 4 months of age. By 6 months, many can sit without support, a milestone that indicates improved muscle strength and coordination. The World Health Organization (WHO) recommends introducing solid foods at around 6 months, aligning with the development of digestive and motor skills. As per the AAP, crawling generally begins between 6 and 10 months, and walking may start between 9 and 12 months. Speech development, including the utterance of first words, often occurs around the 12-month mark.

Common Questions Parents Ask

Parents often wonder about the timing and sequence of developmental milestones. For instance, many ask about the average age for crawling, which typically occurs between 6 to 10 months, according to research. Other common inquiries include the best ways to encourage development, such as engaging in interactive play and reading, which the AAP endorses for cognitive growth.

Safety Considerations

The safety of babies during their developmental stages is paramount. The CDC advises that parents ensure safe sleep practices, such as placing babies on their backs to sleep, to reduce the risk of Sudden Infant Death Syndrome (SIDS). When introducing solid foods, WHO guidelines stress the importance of avoiding choking hazards by offering appropriately sized and textured foods. Always supervise babies during playtime to prevent accidents.

When to Contact Your Pediatrician

While each child develops at their own pace, certain signs may warrant consultation with a pediatrician. If your baby is not reaching key milestones, such as sitting by 9 months or speaking by 18 months, a professional evaluation is recommended. Additionally, any signs of developmental regression or loss of skills should be promptly addressed with healthcare providers.

The Bottom Line

Baby development is a complex process involving various stages that are generally predictable yet unique to each child. Adhering to guidelines from the AAP, CDC, and WHO can help ensure that your baby is on the right track. Regular check-ups with a pediatrician are essential for monitoring progress and addressing any concerns early on. Remember, while milestones provide a framework, every child is unique, and deviations from the norm can be perfectly normal.

Frequently Asked Questions

At what age do babies start to crawl?

Most babies start to crawl between 6 and 10 months, as they develop the necessary muscle strength and coordination.

When can babies sit up on their own?

According to the CDC, many babies can sit without support by around 6 months of age.

What are the first signs of teething?

Teething often starts between 4 to 7 months, with signs including drooling, gum swelling, and irritability.

How can I encourage my baby's development?

Engage in activities like tummy time, reading, and playing, which are recommended by the AAP to support motor and cognitive development.

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

If your baby is not reaching milestones, such as not sitting by 9 months, consult your pediatrician for an evaluation.

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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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