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Sensory milestones for your 3-to-6-month-old
By 3–6 months most babies smoothly track moving objects with their eyes, turn towards your voice and sounds, bring hands and toys to the mouth, and reach for things they see. These are gentle guides, not deadlines — every baby blooms on their own timeline. A check is wise if your baby doesn't react to sound or doesn't fix and follow with their eyes.
In this answer 5 sections
Between three and six months, your baby is discovering the world through their senses — every gaze, reach and turn towards your voice is a quiet milestone.
In short
By 3–6 months, most babies track moving objects smoothly with their eyes, turn towards sounds and your voice, bring hands and objects to their mouth to explore, and begin reaching for things they can see. These are typical sensory milestones — every baby blooms on their own gentle timeline, so think of these as a guide, not a deadline.
What to look for
Vision (seeing)
- Follows a moving toy or face smoothly from side to side
- Watches your face closely and shows interest in bright colours and patterns
- Reaches towards objects within sight by around 4–5 months
Hearing (listening)
- Turns head towards your voice or a soft sound
- Calms, startles or brightens in response to familiar sounds
- Enjoys back-and-forth cooing and noticing musical toys
Touch & mouthing (exploring)
- Brings hands together and to the mouth to explore
- Grasps and mouths toys to learn their texture
- Settles with gentle holding and skin-to-skin contact
The science
In the WHO ICF framework, these fall under Sensory functions (b2) — the building blocks of how a baby receives and makes sense of sight, sound and touch. In these months the brain is rapidly wiring vision, hearing and tactile pathways together, which is why reaching towards a seen object is such a meaningful step: it shows the senses are teaming up.
The Pinnacle way
Developmental measurement supports care planning; diagnosis requires an appropriately qualified healthcare professional. under qualified clinician care — never from an online list. If your baby consistently doesn't react to sounds or doesn't fix and follow with their eyes, a gentle check is the kind, sensible next step. Explore occupational therapy and how the AbilityScore® is calculated.
Trusted sources
Aligned with the WHO ICF sensory functions (b2) framework and trusted paediatric developmental guidance on early infant milestones.
Next step — if anything feels off, book a relaxed developmental check with our team on WhatsApp at +91 91001 81181.
This is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.
CONNECT THE ANSWER TO YOUR CHILD’S DAY
Something to notice. Something to discuss.
What to notice
Arrange a check if by 6 months your baby doesn't turn towards sounds or your voice, doesn't fix and follow a moving face or toy with their eyes, or rarely brings hands or objects to the mouth to explore.
In everyday life
Sit face-to-face and slowly move a colourful toy side to side, then shake it gently off to one side — watch your baby follow with their eyes and turn towards the sound. It's play and a mini sensory check in one.
Bring your observations and questions to your child’s professional. Choose activities that suit your child’s comfort, abilities and agreed plan.
Bring your questions to a first visitQuestions families ask
Is it normal that my 4-month-old isn't reaching for toys yet?
Reaching usually emerges around 4–5 months, so a little later is often within the normal range. Keep offering toys within sight and reach. If your baby still isn't reaching or showing interest by 6 months, a gentle developmental check is sensible.
How do I know if my baby can hear properly?
Watch for turning towards your voice, calming to familiar sounds, or brightening at music. If your baby consistently doesn't react to everyday sounds, ask for a hearing check promptly — early hearing support makes a big difference.
Should I worry if my baby puts everything in their mouth?
Not at all — mouthing is a healthy, expected way babies explore texture and shape at this age. Just keep small or unsafe objects out of reach.
FOLLOW THE SOURCE
References behind this answer.
- Source referenceICF b2
- Source referenceWHO ICF · Sensory functions (b2)
References are supplied with this answer. An organisation homepage offers further reading; it does not establish an independent review of this page.
Content attribution: SETU Consortium · Pinnacle Blooms Network.
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