Baby Not Smiling Back (No Social Smile)
Medically reviewed by Dr. Emily Torres, PhD, CCC-SLP · Pediatric Speech-Language Pathologist
Content reviewed against published AAP, CDC, AAP guidelines
Last reviewed:
Behavioral development varies greatly from child to child. If you have noticed baby not smiling back (no social smile), here is what you need to know.
The short answer
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.
Key takeaways
- 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.
- Usually normal when: Your baby is under 8 weeks old - social smiling is just beginning to develop and many babies have not started yet
- Call your doctor if: Your baby has lost social smiling they previously had - any loss of a social milestone at any age should be evaluated promptly
- Varies by age — see the age-by-age breakdown below
Parents everywhere have the same worry. You are doing the right thing by looking into it.
What Parents Should Know
According to AAP, CDC guidelines, 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. At 0-6 weeks, before 6 weeks, smiles are generally reflexive - they happen during sleep or at random and are not in response to social interaction. Your baby may appear to smile when passing gas or during certain sleep stages. True social smiling has not yet developed, so the absence of responsive smiling at this age is completely expected and not a concern. It is generally considered normal when your baby is under 8 weeks old - social smiling is just beginning to develop and many babies have not started yet. However, you should contact your pediatrician promptly if your baby has lost social smiling they previously had - any loss of a social milestone at any age should be evaluated promptly.
Normal vs. Concerning
By Age
What to expect by age
0-6 weeks
Before 6 weeks, smiles are generally reflexive - they happen during sleep or at random and are not in response to social interaction. Your baby may appear to smile when passing gas or during certain sleep stages. True social smiling has not yet developed, so the absence of responsive smiling at this age is completely expected and not a concern.
6-12 weeks
This is the key window for the emergence of social smiling. Your baby may begin to smile when they see your face up close, hear your voice, or feel gentle touch. These smiles are different from reflexive ones - they involve the whole face, including the eyes, and are clearly directed at another person. Some babies develop this closer to 6 weeks, others closer to 12 weeks, and both are within normal range.
3-4 months
By 3 months, most babies are smiling socially and regularly - lighting up when they see familiar people, smiling during face-to-face play, and beginning to laugh. If your baby is not showing social smiles by 3 months (adjusted age for preemies), this is a milestone to discuss with your pediatrician. They will want to assess hearing, vision, and overall social development, as early intervention can be very helpful.
4-6 months
By this age, social smiling should be well established. Babies typically smile at familiar people, may smile at their reflection, and are beginning to show different facial expressions for different emotions. Absence of social smiling by 4-6 months warrants a prompt conversation with your pediatrician and possibly a developmental evaluation.
What to Tell Your Pediatrician
- Describe when you first noticed baby not smiling back (no social smile) 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 is 3 months old (adjusted age) and you have not seen any clear smiles directed at people in response to interaction.
- Mention if your baby smiles at objects or randomly but does not smile specifically in response to your face or voice.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Your baby is under 8 weeks old - social smiling is just beginning to develop and many babies have not started yet
- Your baby was premature - use adjusted age, not chronological age, to assess this milestone
- Your baby smiles socially sometimes but not every time, or smiles more with one caregiver than others - consistency comes with time
- Your baby smiles during calm, alert moments but not when overstimulated, tired, or hungry
- Your baby is 3 months old (adjusted age) and you have not seen any clear smiles directed at people in response to interaction
- Your baby smiles at objects or randomly but does not smile specifically in response to your face or voice
- Your baby used to smile socially and has decreased or stopped - any regression in social skills is important to note
- Your baby is not making social smiles and is also not making eye contact, cooing, or showing interest in faces
- Your baby has lost social smiling they previously had - any loss of a social milestone at any age should be evaluated promptly
- Your baby at 4 months or older shows no social smiling, no eye contact, and no interest in faces or social interaction - early developmental evaluation is important
- Your baby is not smiling and also seems unusually floppy, stiff, or has feeding difficulties, which could indicate an underlying neurological concern
What You Can Do at Home
- Keep track of when you notice baby not smiling back (no social smile) — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that your baby is under 8 weeks old - social smiling is just beginning to develop and many babies have not started yet — 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 has lost social smiling they previously had - any loss of a social milestone at any age should be evaluated promptly.
Related Resources
Milestone Checklists by Age
Track your baby's developmental milestones from birth to 5 years with age-specific checklists.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
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 not smiling back (no social smile) normal?
When should I call the doctor about baby not smiling back (no social smile)?
When is baby not smiling back (no social smile) normal?
What causes baby not smiling back (no social smile)?
What should I mention to my pediatrician about baby not smiling back (no social smile)?
Is baby not smiling back (no social smile) normal at 0-6 weeks?
Is baby not smiling back (no social smile) normal at 6-12 weeks?
Should I go to the ER for baby not smiling back (no social smile)?
Does baby not smiling back (no social smile) go away on its own?
References
- [1]American Academy of Pediatrics. Emotional and Social Development: Birth to 3 Months. HealthyChildren.org. AAP
- [2]Centers for Disease Control and Prevention. Important Milestones: Your Baby By Two Months. CDC
- [3]American Academy of Pediatrics. Developmental Milestones: 3 Months. HealthyChildren.org. AAP
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Baby Not Smiling Back (No Social Smile).
Things to mention
- Describe when you first noticed baby not smiling back (no social smile) 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 is 3 months old (adjusted age) and you have not seen any clear smiles directed at people in response to interaction.
- Mention if your baby smiles at objects or randomly but does not smile specifically in response to your face or voice.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Your baby is 3 months old (adjusted age) and you have not seen any clear smiles directed at people in response to interaction
- Your baby smiles at objects or randomly but does not smile specifically in response to your face or voice
- Your baby used to smile socially and has decreased or stopped - any regression in social skills is important to note
Urgent signs to report immediately
- Your baby has lost social smiling they previously had - any loss of a social milestone at any age should be evaluated promptly
- Your baby at 4 months or older shows no social smiling, no eye contact, and no interest in faces or social interaction - early developmental evaluation is important
- Your baby is not smiling and also seems unusually floppy, stiff, or has feeding difficulties, which could indicate an underlying neurological concern
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
Bottom line
Most cases of baby not smiling back (no social smile) are normal. Talk to your pediatrician if your baby has lost social smiling they previously had - any loss of a social milestone at any age should be evaluated promptly.
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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