The first three months look quiet from the outside. Your baby sleeps, feeds, cries, and seems to repeat that on loop. Underneath, an enormous amount is happening — the brain is wiring itself, sensory pathways are myelinating, and the foundations of communication and movement are being laid down at a pace that will not be matched again in life.
Knowing what to look for, and what counts as normal variation versus genuinely worth mentioning, lets you watch your baby change with curiosity rather than worry.
If you log first smile, first sustained eye contact, first time holding the head up steadily in Healthbooq as they happen, you have an accurate record for the 6-week and 8-week health visitor checks rather than scrambling to remember.
The First Month: Reflexes Run the Show
Newborns arrive with a set of primitive reflexes — they are how the brainstem keeps a baby fed and protected before the cortex takes over:
- Rooting: stroke the cheek, the head turns toward the touch and the mouth opens. Made for finding the nipple.
- Sucking: triggered by anything in the mouth.
- Grasping (palmar): a finger placed in the palm gets gripped.
- Moro (startle): sudden movement or noise → arms fling outward, then come back in. Usually fades by 4 months.
- Stepping: hold your baby upright with feet touching a surface and they will make stepping movements. Fades by around 2 months.
- Tonic neck (fencing reflex): head turns to one side → arm on that side extends, opposite arm flexes.
These will fade as the cortex develops more control over movement. Their persistence beyond the typical timeline — for example, a strong Moro past 6 months — is something a clinician would want to look at.
Vision in the first month is functional but limited. Focal range is about 20–30 cm — roughly the distance from the breast or bottle to your face. Contrast is what they see best, which is why high-contrast black-and-white patterns get more attention than soft colours. They can follow a slow-moving face or object within their focal range.
By the end of month one, most babies will:
- Lift their head briefly during tummy time
- Have alert windows of 5–10 minutes at a stretch
- Quiet to a familiar voice — especially the voice they heard most in pregnancy
- Look at faces with clear interest
Six to Eight Weeks: The Social Smile
The social smile is the milestone every parent in the trenches is waiting for. It is also a real developmental marker — the first clear sign that the cortex is mediating social response, not just the brainstem reacting to stimuli.
It usually appears between 5 and 8 weeks. The earlier "wind smiles" of the first weeks are fleeting facial movements, not directed at anything. The social smile is different: it is a response to your face, your voice, a familiar interaction. The whole face does it. Once you have seen it, you cannot mistake it.
After this, the change accelerates: alert windows lengthen, eye contact gets sustained, and your baby starts making vocal sounds in response to your voice — the start of proto-conversation. You speak, they pause and watch, they make a sound back, you reply. That back-and-forth is the foundation of language.
Talk to your GP or health visitor if by 8 weeks there is no social smile, or your baby does not seem to make eye contact when you bring your face into their focal range.
Three Months: Active Engagement
By 3 months the transformation is striking. The reflexive newborn is gone. In their place:
- Awake and alert for several hours across the day in a few longer windows
- Sustained eye contact, including across short distances (a metre or so)
- Smooth tracking of a moving face or object in a wide arc
- Cooing — drawn-out vowel sounds ("ahhh," "ohhh") — and sometimes early laughing
- Whole-body excitement during social play: kicking legs, waving arms, big grin
- Head held steady when supported in sitting
- Pushing up on forearms during tummy time
- Hands open most of the time, often noticed and studied
- Reaching toward objects (not yet reliably grasping)
The grasp reflex is fading. Voluntary, intentional reaching is starting to take over.
When to Talk to Your GP or Health Visitor
Range matters more than a single date — appearing a week or two before or after is normal. The behaviours below are worth raising at your next contact rather than waiting to see if they appear:
- No response to loud sounds at any point in the first 2 months
- No social smile by 10 weeks
- No eye contact with familiar people by 2–3 months
- Significant asymmetry — one arm or leg consistently doing much less than the other, or head turned to one side persistently
- Persistent extreme floppiness or stiffness — a baby who feels limp or who seems rigid most of the time
- Not lifting the head at all during tummy time by 2 months
- Hands fisted tightly all the time at 3 months (cortical thumb)
- Loss of a skill that was previously present
Mentioning something early is always better than waiting. Most of the time the answer is reassurance. When it is not, getting in early is what gives a referral the best chance of helping.
Key Takeaways
The first three months take a baby from pure reflex to genuine social engagement. The big visible milestones are the social smile around 6–8 weeks, head lifting on the tummy by 2 months, smooth visual tracking by 3 months, and cooing in proto-conversation. Range matters more than a single date — most milestones have a 2–4 week normal window. Talk to your GP or health visitor if by 8 weeks your baby has no social smile, no eye contact by 2–3 months, no response to loud sounds, persistent floppiness or stiffness, or one side of the body consistently doing less than the other.
