6-to-9-month-old
Signs of social delay in a 6-to-9-month-old
By 6–9 months most babies are sharing smiles, turning to your voice, enjoying peek-a-boo and recognising familiar faces. Reasons to seek a gentle developmental check include rarely smiling back, not responding to your voice, little eye contact or shared joy, being hard to engage in back-and-forth play, or losing a social skill once had. This is not a diagnosis — babies vary widely — but an early calm look helps, because support works beautifully at this age.
Those first belly-laughs, the peek-a-boo giggles, the way your baby lights up when you walk in — these are the social sparks we gently watch for at this age.
In short
By 6–9 months most babies are warming up socially — sharing smiles, turning to your voice, enjoying back-and-forth play like peek-a-boo, and showing they know familiar faces. A few gentle reasons to seek a developmental check are when your baby rarely smiles back at you, doesn't turn or respond to your voice, shows little eye contact or shared joy, or seems hard to engage in playful to-and-fro. None of this is a diagnosis — babies vary widely — but a calm clinician's look now is wise, because early support works beautifully at this age.What's typical — and what to watch — at 6–9 months
Social development at this stage is mostly about connection and back-and-forth. Lovely things you'll often see: a baby who smiles when you smile, babbles in a chatty back-and-forth, enjoys games like peek-a-boo, reaches to be picked up, watches faces closely, and shows they recognise familiar people. Many also begin to look wary of strangers — a healthy sign they know who's who.Gentle flags that deserve a clinician's eye:
- Little shared smiling — rarely smiling back at you or responding to your warmth and silly faces.
- Not responding to voice or name sounds — not turning towards you, not seeming to notice familiar voices.
- Limited eye contact or shared joy — not following your gaze, not lighting up during cuddles or play.
- Hard to engage — little interest in back-and-forth games, or seeming content to be on their own most of the time.
- Loss of a skill — a social warmth or babble that was there and has faded.
The aim is never alarm — it's that an early, calm observation turns small questions into early opportunities.
When to seek a check
If any of these are part of your everyday picture — especially several together, or a skill that has slipped — arrange a developmental check now rather than waiting. Trust your parent instinct; what you notice every day is valuable information for a clinician.The Pinnacle way
A clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care — never from an online list. Our clinicians watch how your baby connects, smiles, listens and plays, and shape gentle support around your everyday moments together. Explore our occupational therapy and play-based early support, and read more [about Pinnacle](/) and how we walk with families.Trusted sources
CDC developmental milestones and "Learn the Signs, Act Early" guidance for 6–9 month social and emotional development; American Academy of Pediatrics (healthychildren.org) on infant social-emotional growth and developmental monitoring; WHO Nurturing Care framework on responsive caregiving in infancy.Next step — Trust what you've noticed. Book a developmental check with a Pinnacle clinician for a calm, clear review of your baby's smiles, sounds and social play.
This is general information, not a diagnosis — a clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre under qualified clinician care.
What to watch
Seek a developmental check if your 6–9-month-old rarely smiles back, doesn't turn or respond to your voice, shows little eye contact or shared joy, is hard to engage in back-and-forth play like peek-a-boo, or has lost a social skill they once had — especially if several appear together.
Try this at home
Play short bursts of face-to-face games — peek-a-boo, copying your baby's sounds, exaggerated smiles. Notice whether your baby smiles back, watches your face, and takes turns. A quick phone note of what sparks connection gives a clinician a clear, useful picture.
Trusted sources
Developed by SETU Consortium · Pinnacle Blooms Network · Last reviewed 2026-06-10 · reviewed every 365 days
This is general information, not a diagnosis. A clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care.
Frequently asked
Is it normal for my 6-month-old to not smile much yet?
Babies vary, and some are quieter by nature, but most 6-month-olds share smiles and enjoy face-to-face play. If your baby rarely smiles back, doesn't respond to your voice, or seems hard to engage, a calm developmental check is wise — not because something is wrong, but because early support works best when started gently and early.
My baby is shy with strangers — is that a social problem?
Quite the opposite. Becoming wary of unfamiliar people around 6–9 months is a healthy sign your baby clearly recognises familiar faces and forms attachments. It's a normal and reassuring part of social development at this age.
What's the difference between social delay and just a calm temperament?
Many babies are naturally more reserved, yet still share smiles, watch faces and warm up to people they know. The signs worth a check are an ongoing pattern — little shared joy, not responding to your voice, very limited eye contact, or a skill that has faded. A clinician helps tell temperament from a delay through a structured look at the whole picture.