Behavior & Social

Baby's Social Smile Is Delayed

Medically reviewed by Dr. Emily Torres, PhD, CCC-SLP · Pediatric Speech-Language Pathologist

Content reviewed against published CDC, AAP, Zero to Three guidelines

Editorial policy

Last reviewed:

Behavioral development varies greatly from child to child. If you have noticed baby's social smile is delayed, here is what you need to know.

The short answer

A social smile, where a baby smiles in response to seeing a face or hearing a voice, typically appears between 6 and 8 weeks of age. Some babies smile socially a bit later, especially if born premature. If your baby has not shown any social smiling by 3 months, mention it to your pediatrician, as social smiling is an important social-emotional milestone.

Key takeaways

  • A social smile, where a baby smiles in response to seeing a face or hearing a voice, typically appears between 6 and 8 weeks of age. Some babies smile socially a bit later, especially if born premature. If your baby has not shown any social smiling by 3 months, mention it to your pediatrician, as social smiling is an important social-emotional milestone.
  • Usually normal when: Your baby is under 8 weeks and showing reflexive smiles but not yet social smiles
  • Call your doctor if: Your baby is over 4 months with no social smiling and limited eye contact
  • Varies by age — see the age-by-age breakdown below

This is one of the most common questions parents ask. Searching for answers means you care.

What Parents Should Know

According to CDC, AAP, Zero to Three guidelines, a social smile, where a baby smiles in response to seeing a face or hearing a voice, typically appears between 6 and 8 weeks of age. Some babies smile socially a bit later, especially if born premature. If your baby has not shown any social smiling by 3 months, mention it to your pediatrician, as social smiling is an important social-emotional milestone. At 0-6 weeks, babies show reflexive smiles, often during sleep. These are not true social smiles. Your baby may also smile in response to pleasant physical sensations. True social smiling in response to faces has not yet developed. It is generally considered normal when your baby is under 8 weeks and showing reflexive smiles but not yet social smiles. However, you should contact your pediatrician promptly if your baby is over 4 months with no social smiling and limited eye contact.

Sources: [1], [2], [3]

Normal vs. Concerning

Usually Normal
Worth Discussing
Your baby is under 8 weeks and showing reflexive smiles but not yet social smiles
Your baby is over 4 months with no social smiling and limited eye contact
Your baby was born premature and is smiling on an adjusted-age timeline
Your baby has lost social smiling alongside other skill regression
Your baby smiles socially but less frequently than other babies you know
Your baby has not shown any social smiling by 3 months of age
Your baby smiles more at home than in unfamiliar settings
Your baby smiles reflexively but never in response to a face or voice

By Age

What to expect by age

0-6 weeks

Babies show reflexive smiles, often during sleep. These are not true social smiles. Your baby may also smile in response to pleasant physical sensations. True social smiling in response to faces has not yet developed.

6-8 weeks

This is when most babies begin smiling in response to a caregiver's face or voice. The social smile is a major milestone that shows your baby is recognizing and responding to people. Some babies are a bit later, especially premature babies.

2-3 months

Social smiling should be well-established. Your baby smiles when they see familiar faces and may smile at new people too. If social smiling has not appeared by 3 months, discuss this with your pediatrician.

3-4 months

Babies smile frequently and begin laughing. They show clear enjoyment of social interaction. A baby who still does not smile socially at this age should be evaluated for both vision and developmental concerns.

4-6 months

Smiling is a robust social behavior. Babies smile at familiar people and may be more selective about smiling at strangers. Absence of social smiling by this age requires comprehensive developmental evaluation.

What to Tell Your Pediatrician

  • Describe when you first noticed baby's social smile is delayed and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if your baby has not shown any social smiling by 3 months of age.
  • Mention if your baby smiles reflexively but never in response to a face or voice.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

What Should You Do?

When to take action

Probably normal when...
  • Your baby is under 8 weeks and showing reflexive smiles but not yet social smiles
  • Your baby was born premature and is smiling on an adjusted-age timeline
  • Your baby smiles socially but less frequently than other babies you know
  • Your baby smiles more at home than in unfamiliar settings
Mention at your next visit when...
  • Your baby has not shown any social smiling by 3 months of age
  • Your baby smiles reflexively but never in response to a face or voice
  • Your baby had been smiling and has stopped
Act now when...
  • Your baby is over 4 months with no social smiling and limited eye contact
  • Your baby has lost social smiling alongside other skill regression

What You Can Do at Home

  • Keep track of when you notice baby's social smile is delayed — noting the time of day, duration, and any triggers can help your pediatrician.
  • Remember that your baby is under 8 weeks and showing reflexive smiles but not yet social smiles — this is generally within the range of normal.
  • At 0-6 weeks, focus on observation rather than intervention unless your pediatrician advises otherwise.
  • Respond consistently and calmly to your baby's behavior. Maintain predictable daily routines.
  • While monitoring at home, seek immediate care if your baby is over 4 months with no social smiling and limited eye contact.

Baby Not Smiling Back (No Social Smile)

A social smile - smiling specifically in response to seeing a face, hearing a voice, or during interaction - is one of the earliest and most meaningful social milestones. It typically develops between 6-12 weeks of age. While a general smile might happen randomly, a social smile is directed at people and shows your baby is connecting with you. If your baby is not showing social smiles by 3 months, it is worth discussing with your pediatrician.

Baby Not Smiling

Most babies begin smiling reflexively in the first few weeks and develop a true, intentional smile between 6-12 weeks of age. The timeline varies from baby to baby, and premature babies may smile later based on their adjusted age. If your baby is not smiling at all by 3 months, it is worth mentioning to your pediatrician, but many babies simply take a little longer.

Baby Flat Affect - Limited Facial Expressions or Emotions

Babies should show a range of facial expressions from early infancy. A social smile (smiling in response to a face or voice) typically appears by 6-8 weeks. By 3-4 months, most babies are expressive - smiling, laughing, frowning, and showing surprise. A baby who consistently shows limited facial expressions, rarely smiles, and does not seem to react emotionally to their environment should be evaluated. While some babies are naturally more serious or observant, persistent flat affect can be an early sign of developmental differences, sensory issues, or, rarely, medical conditions.

Milestone

Milestone Checklists by Age

Track your baby's developmental milestones from birth to 5 years with age-specific checklists.

Milestone

Month-by-Month Development

Detailed monthly development guides from birth through 24 months.

Guide

When to Call the Doctor

General guide on when to call the pediatrician, visit urgent care, or go to the ER.

Frequently asked questions

Is baby's social smile is delayed normal?
A social smile, where a baby smiles in response to seeing a face or hearing a voice, typically appears between 6 and 8 weeks of age. Some babies smile socially a bit later, especially if born premature. If your baby has not shown any social smiling by 3 months, mention it to your pediatrician, as social smiling is an important social-emotional milestone.
When should I call the doctor about baby's social smile is delayed?
Your baby is over 4 months with no social smiling and limited eye contact Your baby has lost social smiling alongside other skill regression
When is baby's social smile is delayed normal?
Your baby is under 8 weeks and showing reflexive smiles but not yet social smiles Your baby was born premature and is smiling on an adjusted-age timeline Your baby smiles socially but less frequently than other babies you know
What causes baby's social smile is delayed?
A social smile, where a baby smiles in response to seeing a face or hearing a voice, typically appears between 6 and 8 weeks of age. Some babies smile socially a bit later, especially if born premature. If your baby has not shown any social smiling by 3 months, mention it to your pediatrician, as social smiling is an important social-emotional milestone. Common explanations include: Your baby is under 8 weeks and showing reflexive smiles but not yet social smiles. Your baby was born premature and is smiling on an adjusted-age timeline.
What should I mention to my pediatrician about baby's social smile is delayed?
You should mention baby's social smile is delayed at your next visit if: Your baby has not shown any social smiling by 3 months of age. Your baby smiles reflexively but never in response to a face or voice. Your baby had been smiling and has stopped.
Is baby's social smile is delayed normal at 0-6 weeks?
Babies show reflexive smiles, often during sleep. These are not true social smiles. Your baby may also smile in response to pleasant physical sensations. True social smiling in response to faces has not yet developed.
Is baby's social smile is delayed normal at 6-8 weeks?
This is when most babies begin smiling in response to a caregiver's face or voice. The social smile is a major milestone that shows your baby is recognizing and responding to people. Some babies are a bit later, especially premature babies.
Should I go to the ER for baby's social smile is delayed?
Seek emergency care if your baby is over 4 months with no social smiling and limited eye contact, or if your baby has lost social smiling alongside other skill regression. When in doubt, call your pediatrician's after-hours line for guidance.
Does baby's social smile is delayed go away on its own?
In many cases, baby's social smile is delayed resolves on its own, especially when your baby is under 8 weeks and showing reflexive smiles but not yet social smiles. By 4-6 months, smiling is a robust social behavior. Babies smile at familiar people and may be more selective about smiling at strangers. Absence of social smiling by this age requires comprehensive developmental evaluation.
CDCAAPZERO TO THREE

References

  1. [1]Centers for Disease Control and Prevention. Important Milestones: Your Baby By Two Months. CDC
  2. [2]American Academy of Pediatrics. Emotional and Social Development: Birth to 3 Months. HealthyChildren.org. AAP
  3. [3]Zero to Three. Social-Emotional Development: Birth to 3 Months. Zero to Three

Doctor Visit Checklist

Bring this checklist to your next pediatrician visit to discuss Baby's Social Smile Is Delayed.

Things to mention

  • Describe when you first noticed baby's social smile is delayed and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if your baby has not shown any social smiling by 3 months of age.
  • Mention if your baby smiles reflexively but never in response to a face or voice.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

Observations to share

  • Your baby has not shown any social smiling by 3 months of age
  • Your baby smiles reflexively but never in response to a face or voice
  • Your baby had been smiling and has stopped

Urgent signs to report immediately

  • Your baby is over 4 months with no social smiling and limited eye contact
  • Your baby has lost social smiling alongside other skill regression

My notes

From ismybabyalright.com — free, evidence-based baby health guides

All content follows our editorial policy and is reviewed against published clinical guidelines.

2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members

Related Resources

Milestone ChecklistsEarly Intervention DirectoryBaby Tracker

Bottom line

Most cases of baby's social smile is delayed are normal. Talk to your pediatrician if your baby is over 4 months with no social smiling and limited eye contact.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.

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Baby Not Smiling Back (No Social Smile)

A social smile - smiling specifically in response to seeing a face, hearing a voice, or during interaction - is one of the earliest and most meaningful social milestones. It typically develops between 6-12 weeks of age. While a general smile might happen randomly, a social smile is directed at people and shows your baby is connecting with you. If your baby is not showing social smiles by 3 months, it is worth discussing with your pediatrician.

Baby Not Smiling

Most babies begin smiling reflexively in the first few weeks and develop a true, intentional smile between 6-12 weeks of age. The timeline varies from baby to baby, and premature babies may smile later based on their adjusted age. If your baby is not smiling at all by 3 months, it is worth mentioning to your pediatrician, but many babies simply take a little longer.

Baby Flat Affect - Limited Facial Expressions or Emotions

Babies should show a range of facial expressions from early infancy. A social smile (smiling in response to a face or voice) typically appears by 6-8 weeks. By 3-4 months, most babies are expressive - smiling, laughing, frowning, and showing surprise. A baby who consistently shows limited facial expressions, rarely smiles, and does not seem to react emotionally to their environment should be evaluated. While some babies are naturally more serious or observant, persistent flat affect can be an early sign of developmental differences, sensory issues, or, rarely, medical conditions.

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