Baby Isn’t Communicating — Is It Normal?
 Category | Communication |
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Medically reviewed by pediatrician Alexandra Zglavosiy
By 4 months, babies usually coo, smile, look at faces, and respond to voices. If your baby is quiet, shows little interest in people, and doesn’t react to your voice, it may point to hearing or communication delays. It’s best to talk to your doctor — the earlier support starts, the more effective it is.
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What’s Inside
Quick takeaways
- By 4 months, babies usually smile, coo, make “ah” or “oh” sounds, look at faces, and respond to voices.
- Lack of these behaviors may indicate early signs of speech delay, hearing loss, or autism.
- Parental observations matter — don’t hesitate to share concerns with a doctor.
- It’s better to check early than to miss a crucial window — early intervention is most effective before 12 months.
What babies typically do between 4–6 months
Signs of typical development
- Cooing and making simple sounds
- Looks at faces and smiles back
- Listens to voices
- Turns head toward sound
- Changes facial expressions during interaction
Possible red flags
- Makes no sounds at all
- Doesn’t show interest in faces
- Doesn’t smile back
- Doesn’t respond to loud sounds
- Doesn’t follow parents with eyes
- Doesn’t try to mimic facial expressions or voice
If you observe 2 or more of these — discuss hearing testing and a neurologist consultation with your pediatrician
Possible causes
- Hearing issues. Including chronic ear infections, congenital hearing loss, or auditory processing difficulties.
Ask your doctor for an audiological evaluation.
- Social-communication differences. Such as early signs of autism. These can be subtle at this age, but a lack of facial engagement or vocalization can be important clues.
This is not a diagnosis — but a reason to begin observation
- Global developmental delay. Sometimes it’s a temporary delay that improves with communication support and stimulation.
What you can do at home
- Talk to your baby even if they don’t respond
- Sing, read, and repeat simple sounds
- Use facial expressions and gestures
- Maintain eye contact
- Show and name toys
Where to get help
Frequently Asked Questions About Babies Who Don't Coo or Respond
What should a 4-month-old baby do socially?
By 4 months, babies usually smile, coo, look at faces, and respond to voices. Many also make simple sounds like "ah" or "oh," listen to speech, and turn their head toward sounds.
Is it normal if my baby isn't cooing at 4–5 months?
Some babies develop at a slightly different pace, but a lack of cooing or response to interaction can be a reason to talk with a doctor. It's especially important to pay attention if your baby doesn't smile back, look at faces, or react to sounds.
Why doesn't my baby respond to voices or make eye contact?
Possible causes include hearing problems, social-communication differences, or developmental delays. Lack of interest in faces, sounds, or interaction can be an early sign that further evaluation may be helpful.
What should I do if my baby doesn't communicate or respond?
Try talking, singing, using facial expressions, and maintaining eye contact during everyday interactions. If your baby makes no sounds, doesn't respond to voices, or shows several warning signs at once, discuss hearing testing and developmental evaluation with your pediatrician.
With care
Our articles are based on evidence-based medicine and reviewed by pediatricians. However, they do not replace a consultation with your doctor. Every child is unique — if you have any concerns, please consult a medical professional.
Sources
- CDC’s Developmental Milestones, U.S. Centers for Disease Control and Prevention, https://www.cdc.gov/ncbddd/actearly/milestones/index.html. Accessed 10 May 2025.
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- Child growth standards, WHO, https://www.who.int/tools/child-growth-standards/standards. Accessed 7 May 2025.
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