At some point in the first couple of months, almost every new parent wonders the same thing: Should my baby be doing this yet?
The first three months are full of change. Your newborn starts becoming more alert and engaged with the world. You'll probably notice the first real smile, the first coos, stronger head control, and those moments when they suddenly seem to be taking everything in. It's no surprise that many parents want a sense of what's coming next.
The CDC's milestone checklists describe what most babies - around 75% - can do by a given age, and healthy babies routinely hit individual skills earlier or later than the list suggests. The list's job is to help you notice patterns worth mentioning at a checkup, and to help you enjoy what's coming.
Key Takeaways
- The headline milestones of the first three months: the social smile (around 2 months), steadier head control (building from 2 to 3 months), cooing (2 to 3 months), and tracking faces and objects with the eyes.
- Milestones describe what most babies do by an age - about 75% of children - so a baby working on a skill slightly later is usually still within normal range.
- Daily awake tummy time is the single best milestone workout for this stage; it builds the neck, shoulder, and arm strength behind almost everything on the list.
- If your baby was born early, track milestones by adjusted age (age from the due date, rather than the birth date) until around age two.
- One missed item rarely means anything on its own. A cluster of missed milestones, or a skill that disappears after your baby had it, is what warrants a conversation with your pediatrician.
Newborn Milestones: The First Month
The first month looks quiet from the outside, and it is doing enormous work underneath. Movements are jerky and reflex-driven at first, and gradually become smoother as the weeks pass. What you can expect to see by around one month:
- Movement - brief head-lifting during tummy time, hands held mostly in fists, strong newborn reflexes (rooting, grasping, startling).
- Vision - focus is sharpest at 8 to 12 inches, which happens to be the distance to your face during a feed. Newborns prefer faces and high-contrast patterns over anything else you can show them.
- Hearing and sound - startles at loud noises, calms to familiar voices, begins making small throaty sounds beyond crying.
- Social - settles when picked up and spoken to, and studies your face during alert windows.
Those short alert windows are the whole curriculum right now. Talking, singing, holding your baby close, and doing a couple of minutes of tummy time a few times a day is genuinely all the 'development activity' this month requires.
2 Month Old Milestones: The First Big Checkpoint
Two months is the first formal checkpoint on the CDC milestone checklist, and it delivers the milestone everyone has been waiting for.
The social smile. Around two months, your baby smiles in response to you talking or smiling at them - a real, directed, lights-up-when-they-see-you smile, distinct from the fleeting reflex smiles of the newborn weeks. It tends to arrive right around the point of peak sleep deprivation, which feels like excellent design.
The rest of the 2-month picture:
- Social and emotional - calms when spoken to or picked up, looks at your face, seems happy when you approach.
- Language - makes sounds other than crying, and reacts to loud sounds.
- Movement - holds their head up during tummy time, moves both arms and both legs, and opens their hands briefly.
- Thinking and seeing - watches you as you move around the room, and holds attention on a toy for several seconds.
Notice how much of this list is about connection - smiling, calming, watching. At two months, social development and brain development are the same project.
3 Month Old Milestones: Stronger, Chattier, More You-Focused
By three months, the newborn haze is lifting and a small personality is unmistakably in the room. Typical skills in the 1-to-4-month window include:
- Head and upper body control - during tummy time, your baby raises their head and chest and begins supporting the upper body with their arms. Held upright, their head is noticeably steadier.
- Hands come online - fists unclench, hands open and shut, come together at the middle, and go to the mouth. Around now babies start swiping at dangling objects and briefly grasping toys placed in their hand.
- Cooing and early conversation - vowel sounds ('ooh,' 'aah') arrive, often in back-and-forth exchanges where your baby answers your voice with sounds of their own.
- Vision extends - your baby follows moving objects, recognizes familiar people at a distance, and starts coordinating hands and eyes. Visual range has stretched from a foot to several yards.
- Legs join in - vigorous kicking, stretching, and pushing down when feet touch a firm surface.
Rolling belongs mostly to the next chapter - intentional rolling typically develops between four and six months - but some strong babies surprise everyone with an accidental tummy-to-back roll around now, which is the moment to stop leaving them unattended on raised surfaces.
How to Support Milestones (Without Turning It Into a Program)
Babies this age develop through ordinary interaction, and the highest-evidence activities are the unglamorous ones:
- Tummy time, awake and supervised, every day. Start with a few minutes several times a day and build up. Getting down at eye level or placing a toy in front of them makes it a game rather than a protest.
- Talk, sing, and narrate. Responding to your baby's sounds - repeating them back, adding words - is exactly how early language builds.
- Follow their gaze. Let your baby study faces, watch you move, and track a slowly moving toy. That's cognitive work at this age.
- Respect the fuss threshold. Overtired babies don't practice skills. Short, frequent play during alert windows beats long sessions.
Nothing on that list requires a product, a class, or a curriculum.
When to Talk to Your Pediatrician
Bring the milestone conversation to every well-baby visit - that's what the visits are for. Between visits, the CDC's guidance is to act early and talk with your child's doctor if your baby isn't meeting one or more milestones, or has lost a skill they once had. For this age range, things worth raising include a baby who, by around two to three months:
- Doesn't respond to loud sounds
- Doesn't watch faces or follow moving things with their eyes
- Doesn't smile at people or at the sound of your voice
- Can't hold their head up at all during tummy time
- Doesn't move both arms and both legs, or seems unusually stiff or unusually floppy
- Loses a skill they previously had - this one always warrants a prompt call
Raising a concern costs nothing and settles the question either way. If support is ever needed, earlier is better - and most of these conversations end with reassurance.
Frequently Asked Questions
When do babies start smiling?
Real social smiles - directed at you, in response to your voice or face - typically arrive around 2 months. Earlier fleeting smiles, often during sleep, are reflexive. If there is no social smiling by the 2-month visit, mention it there; some perfectly healthy babies simply take a few more weeks.
When do babies hold their head up?
In stages. By around 2 months, most babies lift their head during tummy time; by around 3 months, many raise head and chest and prop on their forearms, with steadier control when held upright. Fully independent, reliably steady head control is generally in place around 4 months. You should still support a young baby's head when carrying them.
When do babies start cooing?
Vowel-sound cooing usually emerges between 2 and 3 months, building on the 'sounds other than crying' that appear around the 2-month mark. Answering the coos - repeating them, adding words - actively encourages more.
What should a 3 month old be doing?
The typical 3-month picture: lifting head and chest in tummy time, steadier head control, hands opening and swiping at toys, cooing and responding to voices, smiling readily at people, and visually tracking things across the room. Individual babies mix and match - a chatty baby may be slower on the physical side and vice versa, and both are normal.
When do babies roll over?
Intentional rolling usually develops between 4 and 6 months, often tummy-to-back first. Occasional accidental rolls can happen around 3 months, so treat every surface-with-an-edge as a rolling risk from now on.
My baby was premature - how do I track milestones?
Use adjusted age: count from the due date rather than the birth date. A baby born eight weeks early is expected to hit 2-month milestones around four months after birth. Pediatricians use adjusted age until about age two.
How much tummy time does a 2 month old need?
There is no strict prescription - the working pattern is short sessions, several times a day, while awake and supervised, building up as your baby tolerates more. Many families aim toward a cumulative 15 to 30 minutes daily by around 2 months and more from there. Little and often beats one long battle.
When should I worry about baby milestones?
Look for patterns rather than single items: several missed milestones at a checkpoint age, no response to sound, no eye contact or tracking, marked stiffness or floppiness - or any lost skill. Those are reasons to talk with your pediatrician and ask about developmental screening. One late skill in an otherwise engaged, responsive baby is usually just a baby on their own schedule.
References
- Centers for Disease Control and Prevention. Milestone checklists by age - Learn the Signs. Act Early. https://www.cdc.gov/act-early/resources/milestones-checklist-by-age.html
- Centers for Disease Control and Prevention. Important milestones: Your baby by two months. https://www.cdc.gov/act-early/milestones/2-months.html
- American Academy of Pediatrics / HealthyChildren.org. Developmental milestones: 1-4 months old. https://www.healthychildren.org/English/ages-stages/baby/Pages/Developmental-Milestones-3-Months.aspx
- Mayo Clinic. Infant development: Birth to 3 months. https://www.mayoclinic.org/healthy-lifestyle/infant-and-toddler-health/in-depth/infant-development/art-20048012