Why milestone tracking matters (and why it can stress you out)
In your first weeks with a baby, you become obsessed with a single question: Is my baby normal?
Is their head shape normal? Are they eating enough? Why do they sleep so much? Why are they sleeping so little? Should they be smiling? Are they tracking things with their eyes?
Many of these questions fall into a wide range of typical newborn behaviour. The first three months are also a period of rapid change, so a broad sense of what many families notice can make the uncertainty feel less intense. This article is general information only and isn't medical advice.
Week 1: Adjusting to the outside world
What you might observe
Your newborn spends most time asleep (16-17 hours per day for many babies). When awake, they're focused on basics like feeding, warmth, and being held. They have a "rooting reflex" — stroke their cheek and they'll often turn toward the touch looking for food.
Their eyes might be a bit puffy. They might have "newborn acne" — tiny white bumps on their face that are often temporary.
They'll startle easily. They'll make squeaking and grunting sounds. They might hiccup frequently. A lot of this can be part of typical newborn adjustment.
What's happening developmentally
Your newborn is literally just getting used to existing outside the womb. Their nervous system is adjusting. Their digestive system is sending its first signals. Their temperature regulation is stabilizing.
When to check in promptly
- Unusual lethargy (won't wake for feeds, seems floppy)
- Fever (including over 38°C / 100.4°F)
- Very high or very low temperature
- Grunting with every breath
- Anything that feels like an emergency instinct
Otherwise, the first week can feel strange because everything is new. You're all adjusting.
Weeks 2-4: The "Fourth Trimester"
What you might observe
Somewhere around day 3-5, many babies transition from meconium to greener or browner stools, with later colour and texture varying by feeding pattern.
This is when many parents describe the "witching hour" or what is often called purple crying. Your baby may cry intensely, often in the late afternoon or evening, for no clear reason. For some babies this feels most noticeable around 6 weeks.
Your baby is also starting to regulate their sleep-wake cycle, though it's still very much "eat, sleep, poo" on repeat. Some babies sleep 16+ hours; others sleep 12-14 hours. Both can fall within a broad normal range.
They're making eye contact briefly and might follow a face when it moves across their line of sight (though not yet "tracking" deliberately).
What's happening developmentally
Your baby's brain is waking up. They're beginning to distinguish between day and night (though their preference for sleeping during the day might persist). They're starting to make social reflexes — a "smile" that's often just gas, but it's happening.
Their hearing is fully developed. They recognize your voice from in utero and prefer it to others.
When to check in
- Fewer wet nappies than your care team has told you to expect after day 5
- Weight not recovering as your clinician expects
- Extreme lethargy or difficulty waking for feeds
- Anything that develops suddenly and feels wrong
Weeks 4-8: Social awakening begins
What you might observe
Around 6 weeks, many families start noticing the first intentional social smiles. Your baby may smile at your face more clearly and consistently.
They're also starting to coo — making little vowel sounds. Their eyes are tracking movement more deliberately (not perfectly, but noticeably).
They're still mostly sleeping and eating, but there are longer windows of alert wakefulness. For some babies, these are delightful. For others, this is a fussy stretch.
Their grip reflex is still very strong — they'll grab your finger if you place it in their palm.
What's happening developmentally
Your baby is becoming aware that you are a separate person and also The Person Who Feeds Them. This is huge. They're developing preference for you. They're learning to communicate through sounds and expressions.
Their hearing is helping them learn your voice patterns and the sounds of their environment. They're beginning to recognize recurring rhythms.
When to check in
- Not making eye contact at all, or a change that worries you
- No response to loud noises by 8 weeks
- Weight gain that does not seem to be tracking as your clinician expects
- Extreme feeding difficulties that persist despite support
Weeks 8-12: The personality emerges
What you might observe
By 10 weeks, many babies are smiling on purpose more often. They're often cooing consistently too, though timing can vary.
They're often tracking movement with their eyes more consistently. If you move a toy across their line of sight, they may follow it.
Their grip is loosening slightly — they're starting to open their hands consciously rather than just reflexively grasping.
Many babies start to develop a sleep pattern around 8-10 weeks. Some start to have a longer "night" sleep. Others simply show a timing preference.
What's happening developmentally
Your baby is becoming a social being. They prefer faces to objects. They prefer your voice to strangers. They're learning to self-soothe slightly — many babies find their hands or start to use movement to calm.
They're developing muscle control. By 10-12 weeks, some babies start to hold their head up briefly when on their tummy and have stronger neck control.
They're also developing preferences — some babies love the car, some hate it; some love lying on their back, some prefer their tummy.
When to check in
- No eye tracking by 12 weeks
- Not responding to your voice at all
- Excessive stiffness or floppiness
- Not gaining weight appropriately
- Extreme feeding resistance that interferes with growth
General patterns for the first three months
Sleep
Many newborns sleep 16-17 hours in total, though it is scattered throughout the day and night. By 8-12 weeks, some babies start to consolidate a little more sleep.
Normal variation: Some babies sleep 18-20 hours. Some sleep 12-14. Both can fall within a wide range. If your baby is on the lower end of sleep, the overall picture matters more than one number.
Feeding
- Newborns eat 8-12 times per day (every 2-3 hours)
- By 12 weeks, some babies are managing longer stretches between some feeds
- Some babies extend night sleep while still eating 8-10 times in 24 hours
Normal variation: Fed babies' schedules vary wildly based on appetite and metabolism. Breastfed babies eat more frequently. Formula fed babies might go longer between feeds.
Poops
- First weeks: frequent (6-8+ per day)
- By 4 weeks: still frequent for breastfed babies (can be every feed or once daily; both normal)
- Formula fed babies: typically every 1-4 days
- By 3 months: patterns settle but vary widely
Growth
- Expected weight gain in first weeks: 150-200g per week
- Head circumference: growing steadily
- Length: growing steadily
Worth checking: A sudden drop-off or a pattern that seems out of step with what your clinician expects.
Developmental signs worth getting checked
By 3 months, these things are reasonable to raise with a pediatrician or child health professional:
- Extreme lack of eye contact (staring in one direction, not following faces)
- No response to loud noises at all
- No cooing or vocalizing
- No smiling at 10+ weeks
- Can't support any head control
- Extreme stiffness or extreme floppiness
- Not feeding or feeding very poorly
- Not growing on an appropriate curve
Important: Absence of one skill doesn't mean something's wrong. But absence of several developmental markers warrants checking.
The mental load of tracking
Here's what many parents don't expect: the obsessive tracking that comes with worrying about whether your baby is developing normally.
Is she smiling enough? Is he tracking movement? Is she making enough sounds? Are they sleeping the right amount? Is the poop color okay?
This is where tools like BubSync help enormously. Track feeds, nappies, and sleep so you have data. Look at the patterns. Often, when you see the data clearly, you can tell that your baby is doing fine — you were just worried because you forgot that she fed 30 minutes ago and therefore of course she's sleepy.
The other thing that helps: talk to other parents. Most of what you're worried about, someone else has worried about too and found sat within a normal range.
The reality
In three months, your baby goes from a creature who mostly sleeps, eats, and fills nappies to a person who smiles at you, makes sounds back and forth with you, and shows preference for you specifically.
That's enormous development. And for many babies, it unfolds steadily even if it does not feel like it day to day.
Many newborn behaviours look dramatic before they look familiar. But if something truly concerns you, your pediatrician is there to check. That's not overreacting.
Trust your instincts. Track your data. And remember: newborn behaviour often spans a wider range than most people expect.