At 3 months, a lot starts to change.

The baby may stay awake for longer, pay more attention to their surroundings, follow movements with their eyes and respond more and more to the people around them.

For many families, this is also a stage when some patterns of sleep, feeds and active periods start to become a little easier to recognize.

Even so, there is no routine that works the same way for everyone.

The most important thing is still to watch your own baby's cues and follow their growth and development with the pediatrician.

What does a 3-month-old baby usually do?

Every baby develops at their own pace, but at this stage some skills may start to appear more often.

The baby may:

  • smile in response to people;
  • make little sounds and “chat”;
  • follow faces and objects with their eyes;
  • pay attention to caregivers' voices;
  • move arms and legs in a more coordinated way;
  • bring their hands to their mouth;
  • look at their own hands;
  • hold their head up better;
  • lift their head and part of their chest when lying on their tummy;
  • show greater interest in their surroundings.

The American Academy of Pediatrics highlights that, between birth and 3 months, babies start to look at their own hands more, bring them to their mouth and gain strength in their neck and torso.

These milestones are a reference, not a competition.

They start to “chat” with you

Little by little, communication no longer happens only through crying.

“goo”

and respond when someone talks to them.

Try talking and then waiting a few seconds.

Often the baby responds with sounds, movements or smiles.

These little exchanges help communication develop and strengthen the bond.

Caregivers' faces are still a great toy

There's no need to fill the house with toys to stimulate a 3-month-old baby.

They may be very interested in:

  • faces;
  • voices;
  • music;
  • high-contrast objects;
  • slow movements;
  • different facial expressions.

Talk, smile and let them watch you.

These simple moments already offer plenty of stimulation.

Hands have become interesting

Around this stage, it's common for babies to discover their own hands.

They may look at them, try to bring them together and often put them in their mouth.

This is expected.

Bringing hands to the mouth doesn't necessarily mean teeth are coming in or that the baby is hungry.

It's also a way of exploring and, for some babies, of calming down.

Tummy time is still important

Time spent lying on the tummy — known as tummy time — helps strengthen the muscles of the neck, shoulders and torso.

Always do it:

  • with the baby awake;
  • with an adult supervising;
  • on a safe surface.

You can spread short sessions throughout the day.

If they don't like being on the floor, try placing them tummy-down on your chest at first, while you stay awake and attentive.

With practice, many babies hold their head up better and start to prop themselves up on their forearms.

Don't sit the baby up on their own yet

Even though head control is improving, a 3-month-old baby is not yet ready to stay sitting up on their own.

When holding them, keep giving the head, neck and torso proper support as needed.

Avoid trying to speed up skills by putting the baby in positions they can't yet reach on their own.

Motor development happens gradually.

Holding is still care

Holding a 3-month-old baby does not “spoil” them.

Physical contact, your voice, affection and responding to crying help the baby feel safe.

They still depend on adults to regulate many of their own needs.

This doesn't stand in the way of future independence.

As they develop, they will naturally start to explore their surroundings more and become interested in other ways of interacting.

starts showing signs of sleepiness;

falls asleep again.

You don't need to turn this into a rigid schedule.

Watch for cues.

Some sleep cues may be:

  • yawning;
  • becoming quieter;
  • looking away;
  • getting fussy;
  • rubbing their face;
  • losing interest in interaction.

Putting the baby down to rest before they are overly tired can make falling asleep easier.

Waking at night is still normal

At 3 months, some babies start to sleep for longer stretches at night.

Others don't.

Waking for feeds can still happen and doesn't necessarily mean there's a problem.

Avoid comparing with stories like:

“so-and-so's baby slept eight hours straight at this age”.

Sleep and feeding needs vary a lot from baby to baby.

Help create a simple bedtime routine

A short sequence repeated every day can help the baby recognize that sleep time is coming.

For example:

1. dim the lights;

2. change the diaper;

3. put on comfortable clothes;

4. feed;

5. talk or sing calmly;

6. place the baby in their sleep space.

It doesn't have to happen at exactly the same minute every day.

The idea is to create predictability, not rigidity.

Safe sleep is still the priority

Even though the baby is getting stronger, the guidance remains:

**put them to sleep on their back.**

Use a firm, flat surface suitable for infant sleep.

The crib should be kept free of:

  • pillows;
  • cushions;
  • padded bumpers;
  • stuffed animals;
  • loose blankets;
  • positioners;
  • soft objects.

Sharing a room with caregivers is different from sharing a bed.

The baby should have their own safe space to sleep.

The baby seems to want to roll over. Should I be worried?

Around this stage, some babies start trying out rolling movements.

Even before they can roll over completely, this is an important reminder:

don't leave the baby alone on a bed, sofa, changing table or any other raised surface.

A new skill can appear from one day to the next.

If you need to step away during a diaper change, put the baby in a safe place.

What about burping?

Some babies still swallow a lot of air during feeds.

If they seem uncomfortable, you can try helping them burp.

Over the shoulder

Hold the baby upright, supporting the head and neck, while gently rubbing or patting their back.

Sitting on your lap

Sit the baby on your lap, carefully supporting the chest and head.

Gently rub their back.

Tummy-down across your legs

With the baby awake and supervised, place them tummy-down across your legs, keeping the head and neck well supported.

Not every baby needs to burp after every feed.

If they're comfortable, there's no need to keep trying for a long time.

Feeding is still milk

At 3 months, it's not yet time to start solid foods.

Breast milk is recommended exclusively up to 6 months, when possible.

When the baby is on infant formula, formula also remains the basis of their diet at this age.

Don't offer on your own initiative:

  • water;
  • tea;
  • juice;
  • fruit;
  • purées;
  • other foods.

Starting solids comes later.

Does a 3-month-old baby need water?

If exclusively breastfed, no.

The milk itself provides the hydration they need.

Formula-fed babies should also not routinely be given extra water without guidance.

Formula must be prepared exactly according to the instructions, using the correct amount of water and powder.

Vaccination at 3 months

According to the National Vaccination Calendar (Calendário Nacional de Vacinação) in effect in 2026, the 1st dose of the meningococcal C conjugate vaccine is recommended at 3 months.

It protects against invasive diseases caused by serogroup C meningococcus, including meningitis and meningococcemia. The basic schedule consists of doses at 3 and 5 months, followed later by a booster according to the calendar.

Because the calendar may be updated, always take the Caderneta da Criança (Brazil's Child Health Booklet) to the health clinic to check your child's individual schedule.

The Caderneta da Criança brings together information on:

  • growth;
  • development;
  • vaccination;
  • feeding;
  • health;
  • accident prevention.

It accompanies the child from birth and helps both the family and professionals follow their progress.

There is also a digital version integrated into Meu SUS Digital (the app of SUS, Brazil's public health system), which brings together vaccination, growth, development and other health records.

Make the most of it and talk to your baby a lot

At this stage, interaction is an excellent way to encourage development.

You can:

  • narrate what you're doing;
  • respond to the baby's sounds;
  • sing;
  • read short stories;
  • imitate expressions;
  • let them look at objects;
  • offer moments of tummy time.

There's no need to create a stimulation schedule.

A few minutes spread throughout the day are already enough.

Avoid screens

A 3-month-old baby learns much more by watching people and interacting with their surroundings than by looking at a screen.

TV, phones and tablets are not needed to encourage development at this age.

Use their awake time for closeness, conversation and safe exploration of their surroundings.

Watch out for small objects

Even if the baby can't yet grab everything perfectly, their hands are becoming more and more active — and whatever they manage to grab will probably end up in their mouth.

So:

  • keep small objects out of reach;
  • keep an eye on older siblings and toys with small parts;
  • check the floor and nearby areas;
  • don't leave packaging, coins, bottle caps or small parts within reach.

This attention will become even more important in the coming months.

Crying can still be intense

At 3 months, the baby still uses crying as one of their main ways of communicating.

Check for:

  • hunger;
  • tiredness;
  • diaper;
  • being hot or cold;
  • need to be held;
  • discomfort.

If you are at the limit of exhaustion, put the baby in their crib, on their back, and step away for a few minutes while you regain your calm.

Ask for help or take turns with caregiving when possible.

When should you seek care?

Because the baby is still very small, significant changes deserve attention.

Seek an assessment if there is:

  • difficulty breathing;
  • bluish coloring;
  • significant difficulty waking up;
  • persistent refusal to feed;
  • a significant drop in urine output;
  • repeated or worrying vomiting;
  • seizures;
  • behavior very different from usual.

What about fever?

At under 3 months, a fever needs medical assessment.

When the baby is right at the transition to 3 months, their exact age, the measured temperature and their general condition all matter in deciding what to do.

If there is a fever, or if you're unsure about the temperature of such a young baby, seek professional guidance rather than giving medicine on your own.

What if I think they're not developing a certain skill?

There is a lot of normal variation between babies.

But talk to the pediatrician whenever something worries you.

It's especially important to mention if you notice:

  • loss of a skill the baby already had;
  • little reaction to sounds;
  • little eye contact;
  • significant difficulty moving any part of the body;
  • noticeable floppiness or stiffness;
  • persistent difficulty holding up the head as development progresses.

Regular check-ups make it possible to look at development as a whole, not just at one isolated skill.

At 3 months, interaction gets even more delightful

Now little “conversations” may begin.

You talk.

They watch.

You smile.

They smile back.

You make a sound.

They try to answer.

This is a stage when those more intense newborn weeks begin to make way for new forms of interaction.

There's no need to speed up this progress.

Offer security, affection, proper feeding, opportunities to move and plenty of closeness.

Development happens little by little.

Nilu tip: when the baby is awake and calm, get in front of them and talk for a few minutes. Pause after speaking and wait. At 3 months, you may get a smile, a movement or a sound “reply” — the beginning of many conversations between you. 💛

Reference sources

  • Brazil's Ministry of Health — Child Health Booklet (“Caderneta da Criança”).
  • Brazil's Ministry of Health — 2026 National Vaccination Calendar.
  • Brazil's Ministry of Health — Digital Child Health Booklet (“Caderneta Digital da Criança”).
  • American Academy of Pediatrics / HealthyChildren.org — motor development in the first 3 months.

This content is for educational and informational purposes and does not replace consultations, assessments, diagnosis or individualized guidance from the pediatrician or other health professionals.