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What Are the Baby Developmental Milestones for 4 Months?

Published February 9, 2026Updated February 9, 2026

Quick Answer

Baby developmental milestones at 4 months involve significant advancements in motor skills, social engagement, and communication. Infants begin to show more control over their movements and interact more with their environment.

Key Takeaways

  • Baby developmental milestones at 4 months involve significant advancements in motor skills, social engagement, and communication. Infants begin to show more control over their movements and interact more with their environment.
  • Evidence shows that by 4 months, infants can typically hold their head steady while sitting - according to the CDC.
  • The American Academy of Pediatrics (AAP) recommends monitoring for social smile development, which is common by this age.
  • Studies indicate that most babies can push down on their legs when their feet are on a hard surface by 4 months.
  • According to CDC guidelines, infants may start to babble and make cooing sounds, indicating early communication skills.
  • WHO guidelines suggest that by 4 months, babies should be able to reach for toys and bring them to their mouth.
  • Research published in pediatric development journals shows that infants often show increased interest in social interactions at this age.

Quick Answer

Baby developmental milestones at 4 months involve significant advancements in motor skills, social engagement, and communication. Infants begin to show more control over their movements and interact more with their environment.

What You Need to Know

At 4 months, babies undergo rapid growth and development across various domains. These milestones are essential indicators of healthy development and can vary from child to child. Observing these milestones can help parents and caregivers understand their baby's progress and identify any potential areas where additional support may be needed.

Evidence-Based Guidelines

According to the Centers for Disease Control and Prevention (CDC), by 4 months of age, infants should be able to hold their head steady while sitting, indicating improved neck and upper body strength. The American Academy of Pediatrics (AAP) emphasizes the importance of monitoring social smiles, which typically develop around this age, as a sign of social engagement and emotional development.

Additionally, WHO guidelines suggest that by this age, infants should be reaching for toys and bringing them to their mouth, which helps develop their fine motor skills. Evidence shows that most babies can push down on their legs when their feet are placed on a hard surface, a sign of developing strength and coordination.

Research indicates that babies at this stage may start to babble and coo, demonstrating early communication skills that are crucial for language development.

Common Questions Parents Ask

Here are some common questions regarding 4-month baby milestones:

  • What should my baby be doing at 4 months? At 4 months, your baby should be able to hold their head steady, push down on their legs when standing, and may start to babble. They should also engage more socially, showing interest in interactions.
  • When do babies start to roll over? Most babies begin to roll over between 4 to 6 months. It's essential to provide a safe space for them to explore their movement as they develop this skill.
  • How can I encourage my baby's development at 4 months? You can encourage development by providing tummy time, engaging in play, and talking to your baby often to support their communication skills.
  • Is it normal for my baby to not be meeting all milestones at 4 months? Every baby develops at their own pace. However, if you have concerns about your baby's development, it's important to discuss them with your pediatrician.
  • What social skills should a 4-month-old have? By 4 months, babies typically show social smiles, respond to their name, and enjoy interactions with caregivers. This is a crucial time for social development.

Safety Considerations

It is crucial to ensure a safe environment for your baby as they explore their developing skills. Always supervise your baby during tummy time and playtime. Make sure to remove any small objects that could pose a choking hazard. Additionally, ensure that toys are age-appropriate and free from any potential hazards.

When to Contact Your Pediatrician

Parents should consider contacting their pediatrician if their baby shows any of the following signs: inability to hold head steady, lack of social smile or interest in interactions, or any significant delays in reaching physical milestones like rolling over or babbling. Early intervention can be crucial in addressing developmental concerns.

The Bottom Line

At 4 months, babies typically exhibit advancements in motor skills, social engagement, and communication abilities. Monitoring these milestones is important for ensuring healthy development. If you have concerns about your baby's progress, do not hesitate to reach out to your healthcare provider for guidance and support.

Frequently Asked Questions

What should my baby be doing at 4 months?

At 4 months, your baby should be able to hold their head steady, push down on their legs when standing, and may start to babble. They should also engage more socially, showing interest in interactions.

When do babies start to roll over?

Most babies begin to roll over between 4 to 6 months. It's essential to provide a safe space for them to explore their movement as they develop this skill.

How can I encourage my baby's development at 4 months?

You can encourage development by providing tummy time, engaging in play, and talking to your baby often to support their communication skills.

Is it normal for my baby to not be meeting all milestones at 4 months?

Every baby develops at their own pace. However, if you have concerns about your baby's development, it's important to discuss them with your pediatrician.

What social skills should a 4-month-old have?

By 4 months, babies typically show social smiles, respond to their name, and enjoy interactions with caregivers. This is a crucial time for social development.

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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 insight is generated using RAG (Retrieval-Augmented Generation) from verified health guidelines.

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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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