Baby Development by Month: A Month-by-Month Guide

Your baby’s first year is full of change, but development rarely follows a perfectly tidy calendar. One baby may be fascinated by movement while another is busy experimenting with sounds. Skills can appear gradually, arrive in bursts or emerge at slightly different ages.

This month-by-month guide gives you a broad picture of baby development during the first year, including changes you may notice in movement, communication, play and social interaction. It is a guide rather than a checklist. Developmental milestones describe skills that most children reach around particular ages, but individual timing varies.

If your baby was born prematurely, their healthcare team may discuss development using their corrected age. If you have any concerns about your baby’s progress, speak to your health visitor, GP or another healthcare professional rather than relying on a milestone chart alone.

Understanding baby development month by month

Development covers much more than learning to sit, crawl or walk. The Centers for Disease Control and Prevention groups developmental milestones around how children play, learn, speak, act and move.

During the first year, you may notice changes across several areas at once:

Movement: increasing control of the head and body, reaching, sitting and eventually becoming more mobile.
Hands and coordination: grasping, transferring objects and using the fingers with greater precision.
Communication: reacting to voices, making sounds, babbling and beginning to understand familiar language.
Social development: looking at faces, smiling, enjoying interaction and responding to familiar people.
Learning and play: becoming curious about objects, exploring and beginning to understand simple cause and effect.

There is plenty of variation within typical development. Think of the months below as a way to understand the general direction of development rather than a set of monthly targets.

1 month: adjusting to the world

At one month, your baby is still adapting to life outside the womb. Their movements may look rather jerky and much of their behaviour is driven by reflexes.

You may notice your baby becoming briefly alert and interested in your face or voice. Close contact, gentle talking and simply allowing them to look at you provide plenty of interaction at this stage.

Movement is still developing. Your baby needs their head supported when being held, although they are gradually beginning to develop the muscles that will later give them more control.

There is no need for complicated developmental activities. Talking, cuddling and responding to your baby are meaningful forms of interaction.

2 months: smiles and growing awareness

By around two months, many babies are noticeably more alert.

According to the CDC’s developmental milestones, by two months most babies look at faces, seem happy to see a caregiver, smile when spoken to or smiled at, make sounds other than crying and react to loud sounds.

Movement is becoming more active too. Babies may move both arms and legs and briefly hold their head up while on their tummy.

This is often when interaction starts to feel a little more two-way. You might talk, pause and notice your baby respond with a movement, expression or sound.

3 months: more interaction and body control

The third month often brings increasing awareness of people and surroundings.

Your baby may spend longer watching faces, following interesting movement or listening when you speak. Early coos and other sounds can become part of your everyday exchanges.

Physical control is developing gradually. You may notice steadier head movements and more purposeful arm and leg activity compared with the newborn weeks.

Simple face-to-face interaction remains valuable. Talk about what you are doing, sing songs and respond to the noises your baby makes. The NHS recommends talking to babies throughout ordinary routines and repeating their sounds back to them as part of early communication.

4 months: reaching, laughing and exploring

At around four months, many babies become increasingly active participants in what is happening around them.

The CDC notes that milestones by four months can include smiling to gain attention, chuckling, making sounds back when spoken to and turning towards the sound of a caregiver’s voice.

Hands become more interesting too. Your baby may look at their hands, bring them towards their mouth, hold a toy placed in their hand or swing an arm towards toys.

During tummy time, increasing upper-body strength may become more obvious.

This can be a lovely stage for simple play. Your expressions, voice, songs and safe objects to look at and reach towards offer plenty to explore.

5 months: becoming more purposeful

At five months, skills that have been emerging over previous weeks may start looking more deliberate.

Your baby may become increasingly confident reaching towards interesting objects and exploring them with their hands and mouth. They may be more vocal during play and clearly show excitement when something captures their attention.

You may also notice your baby working hard on movement. Some babies may begin experimenting with rolling around this period, while others do so earlier or later.

As mobility increases, it becomes important to think ahead. A baby who has never rolled before can surprise you, so avoid assuming they will stay in the position where you placed them.

6 months: a more active little explorer

Six months can bring significant changes in how a baby interacts with people and objects.

CDC milestones by six months include knowing familiar people, laughing, taking turns making sounds, reaching for a wanted toy and exploring objects by putting them in the mouth.

Physical skills may include rolling from tummy to back, pushing up with straight arms while on the tummy and leaning on the hands for support while sitting.

These skills are not a requirement for every baby on the exact day they turn six months. The age gives you a useful reference point rather than a deadline.

Keep chatting and playing during ordinary parts of the day. Your baby is learning from repeated interactions with you.

7 months: practising new skills

At seven months, your baby may spend a great deal of time practising skills that started emerging earlier.

Sitting may be becoming steadier. Reaching can become more accurate, and objects may be passed between the hands or investigated from every possible angle.

Some babies start trying to move across the floor around this stage, although there is considerable variation in when and how babies become mobile.

Communication is changing as well. Your baby’s sounds may become increasingly varied, and they may pay close attention when you talk.

The NHS recommends naming and pointing to things you can both see during the 6 to 12 month period. Looking at simple picture books and chatting about the pictures can fit naturally into the day.

8 months: curiosity and mobility

By eight months, your baby’s desire to explore may be very obvious.

They might roll, shuffle, pivot or attempt another method of getting towards something interesting. Some babies may be starting to crawl, while others are perfectly content exploring from a sitting position for longer.

Social awareness can also become stronger. Your baby may clearly recognise familiar people and become more cautious around someone they do not know.

Games involving repetition and anticipation can become especially entertaining. Peekaboo, songs with actions and taking turns making sounds are simple ways to interact.

As your baby’s ability to move changes, regularly review the spaces they can reach. Their capabilities can change quickly.

9 months: sitting, babbling and interacting

At around nine months, many babies are becoming increasingly confident sitting and using their hands to play.

The CDC lists milestones by nine months that include looking when their name is called, reacting when a caregiver leaves, smiling or laughing during peekaboo and making repeated sounds such as “mamamama” or “babababa”.

Babies may also sit without support and move objects between their hands.

Mobility varies considerably. Some babies crawl, some shuffle and some use another way to move around.

The NHS notes that babies may start crawling at around 7 to 10 months, but not all babies crawl. Missing the crawling stage does not automatically mean something is wrong.

10 months: communicating without words

At ten months, your baby’s communication may involve much more than the sounds they make.

Look for gestures, facial expressions, reaching and changes in tone. Your baby may use these alongside babbling to communicate what interests them or what they want.

They may also understand more of your everyday language than they can express.

The NHS encourages parents of babies aged 6 to 12 months to combine words with gestures, such as waving while saying hello or goodbye. Babies may begin copying gestures before they can say the corresponding words.

Physically, some babies are becoming increasingly mobile or experimenting with pulling themselves into different positions.

11 months: increasing independence

At eleven months, familiar skills may be becoming quicker and more coordinated.

Your baby might move confidently around their environment in their preferred way. Some babies may pull themselves up or move while holding onto furniture, while others may not be interested in doing this yet.

Hand movements can become more precise as babies practise picking up and manipulating objects.

Communication continues to develop through babbling, gestures, expressions and increasingly careful listening.

You do not need to constantly teach or test your baby. Everyday opportunities to talk, play, explore and respond to each other are useful developmental experiences.

12 months: approaching the first birthday

By the first birthday, the difference from those early newborn weeks can feel enormous.

According to the CDC, milestones most babies achieve by one year include playing simple games, waving goodbye, calling a parent “mama”, “dada” or another special name, understanding “no”, putting an object into a container, looking for hidden objects, pulling up to stand and walking while holding onto furniture.

Some babies may take independent steps around their first birthday, but walking independently is not something every baby will do at 12 months.

The NHS offers babies a health and development review between 9 and 12 months. This looks at areas including language and learning, and gives parents an opportunity to discuss concerns with the health visiting team.

Your baby’s first birthday is therefore a useful moment to appreciate how much has changed, without treating it as a deadline for completing a particular list of skills.

How to support development throughout the first year

You do not need a complicated programme to encourage your baby’s development.

Many useful interactions happen naturally during an ordinary day. The NHS recommends talking to babies about what you are doing, singing, copying the sounds they make, looking at books together and naming things you can both see.

You can:

talk to your baby during everyday routines
respond to their sounds and expressions
sing songs and nursery rhymes
look at simple books together
offer safe opportunities for movement and exploration
play simple interactive games
follow their attention and talk about what interests them
allow time for quiet rest when they have had enough stimulation

Development does not need to become another job on your list. Warm, responsive everyday interaction gives babies many opportunities to practise emerging skills.

When to get professional advice

Development varies between babies, but you know your child better than any milestone chart.

Speak to your health visitor, GP or another qualified healthcare professional if you are concerned about your baby’s movement, communication, hearing, vision, behaviour or general development. You can ask for advice even if your baby has not reached a particular milestone age.

The CDC advises parents not to wait if a child is not meeting one or more milestones, has lost skills they previously had or if there are other developmental concerns. In the UK, your health visitor or GP can help you decide whether further assessment or support is appropriate.

Your baby’s NHS health and development reviews are also an opportunity to raise questions. In England, a review is offered between 9 and 12 months and includes areas such as language and learning.

A month-by-month guide can help you understand the kinds of changes that happen during the first year, but it cannot assess an individual baby. If something does not feel right, professional advice is more useful than comparing your baby with other children or repeatedly checking milestone lists.