Newborn Development: What to Expect in the First Three Months

The first three months of your baby's life involve more rapid development than almost any period that follows. A newborn who arrives with limited ability to regulate their own temperature, no ability to lift their own head, and no awareness of day and night becomes, by twelve weeks, a baby who smiles deliberately, tracks objects with their eyes, lifts their head during tummy time, and is beginning to find their voice.

This guide covers what's happening developmentally across the first three months, what milestones to watch for, what's normal variation, and what warrants a conversation with your child and family health nurse. It is a general overview rather than a diagnostic tool — every baby develops at their own pace, and the ranges given here reflect normal variation rather than a single expected point.

How development is assessed in the first three months

In Australia, your baby's development is monitored through regular appointments with your child and family health nurse in the first year. These appointments typically occur at two weeks, six weeks, and around three to four months, as well as additional visits in between if you have concerns or if your nurse recommends them.

At each appointment, your nurse will check your baby's weight, length, and head circumference, observe their feeding and behaviour, screen for postnatal depression in the parent, and note developmental progress. They are your primary point of contact for questions about whether something is normal or worth investigating further.

Development in infancy is assessed across four broad domains: gross motor skills involving large muscle movement and posture, fine motor skills involving hand and object manipulation, communication and language including both expression and comprehension, and social and emotional development. Progress in each domain is tracked against expected ranges rather than fixed points.

The first four weeks

The first four weeks are primarily about survival and adjustment for both you and your baby. Developmental expectations are modest because a newborn's most important job is feeding, sleeping, and beginning to regulate basic physiological functions.

What your newborn can do at birth:

Your baby arrives with a set of primitive reflexes that are present from birth and gradually disappear over the first few months as the higher brain takes over. The Moro reflex causes your baby to fling their arms outward when startled. The rooting reflex causes them to turn toward anything that touches their cheek, which is how they find the breast or bottle. The sucking reflex activates when something touches the roof of their mouth. The grasp reflex causes them to grip anything placed in their palm. These reflexes are normal and their presence confirms that your baby's nervous system is functioning.

Your newborn can see, but only clearly at a distance of around 20 to 30 centimetres — approximately the distance between your face and theirs during feeding. They prefer high-contrast patterns and human faces above almost anything else. They can hear well and will often startle at sudden loud noises and settle to familiar voices, particularly the voices they heard in the womb.

What happens in weeks one to four:

Your baby begins to gain weight after the initial drop in the first few days. Most babies regain their birth weight by two weeks. Feeding patterns are frequent and irregular. Sleep is distributed across short stretches throughout the day and night with no meaningful day and night differentiation yet.

By the end of the first month, many babies begin to show their first social smile, though this is often still reflexive or gas-related rather than a genuine social response. True social smiling usually emerges around six to eight weeks. Brief periods of alert, calm wakefulness increase as the weeks progress.

Weeks four to eight

The second month brings the developmental changes that many parents find most rewarding in the early period. Your baby becomes more alert, more engaged, and begins to interact in ways that feel genuinely reciprocal.

Social smiling

The emergence of the first real social smile is one of the most significant milestones of early infancy and typically appears between six and eight weeks. Unlike the reflexive smiles of the newborn period, a social smile is a direct response to your face, your voice, or your interaction. It is deliberate, it engages the whole face including the eyes, and it transforms the experience of early parenthood for most people.

If your baby is not smiling socially by eight to ten weeks, mention it at your child health nurse appointment. It may simply be a matter of individual timing, but it is worth flagging.

Visual tracking

Your baby can now track a moving object with their eyes across a wider field of vision. They begin to show clear preference for human faces and will stare intently at your face during feeding and interaction. Their focus extends beyond the 20 to 30 centimetre range of the newborn period.

Vocalisation

The first non-cry vocalisations emerge in this period. Cooing, soft grunting, and early vowel sounds are the beginning of communication development. Your baby is learning that their sounds produce responses, which is the foundation of language acquisition.

Head control

Neck muscles are strengthening and your baby begins to briefly lift their head during tummy time. Head control when held upright is still limited — you need to support their head at all times during this period. Progress in head lifting varies between babies depending on how much tummy time they are getting and individual developmental pace.

Tummy time

Tummy time is the single most important activity you can do with your baby in the first three months. It strengthens the neck, shoulder, and core muscles that your baby needs for all subsequent gross motor development, and it reduces the risk of positional plagiocephaly — the flattening of one side of the skull that occurs when babies spend too much time in the same position.

Start with short sessions of one to two minutes several times a day from the first days of life. Build gradually to a total of 30 minutes per day by three months. Many babies initially resist tummy time because it is physically hard work. Short, frequent sessions are more effective than trying to extend a session a resistant baby is distressed by.

Always do tummy time when your baby is awake and supervised. Never leave a baby unsupervised on their tummy.

Weeks eight to twelve

By the end of the third month, most babies have changed dramatically from the newborn you brought home from hospital. The development in this period is visible and rapid, and the social engagement that emerges makes this one of the most enjoyable phases for many parents.

Communication and early language

Cooing becomes more varied and more clearly directed at people. Your baby begins to respond to your voice by turning toward you. They may begin to imitate mouth movements if you stick your tongue out and wait. Squealing, laughing sounds, and more complex vocalisations emerge toward the end of this period for many babies.

Talk to your baby constantly during this period. Narrating what you are doing, describing what you see, and responding to their sounds as if they are part of a conversation builds the neural pathways that underpin language development. It does not need to be complex or clever — describing a nappy change in a warm, engaged voice is developmentally valuable.

Gross motor development

Head control improves significantly. By twelve weeks, most babies can lift their head to around 45 degrees during tummy time and hold it briefly when held upright. Leg movements become more vigorous and purposeful. When held in a standing position with feet on a firm surface, your baby may begin to push down with their legs.

Fine motor development

Your baby's hands begin to open more of the time, moving away from the tightly fisted posture of the newborn period. They may begin to bat at objects held in front of them toward the end of this period, though grasping intentionally comes slightly later.

Sleep development

Somewhere in this period, most babies begin to consolidate their longest sleep stretch slightly, often four to six hours rather than the two to three hours of the early weeks. This is not universal — some babies continue waking frequently well beyond three months — but it is the period when many parents notice a shift. Gentle day and night differentiation practices from the early weeks support this consolidation.

Normal variation versus red flags

The ranges given for milestones in this guide reflect normal developmental variation. Some babies do things earlier, many do things later. The absence of a milestone at the expected point is not automatically cause for alarm — it is a prompt for a conversation with your child health nurse rather than immediate concern.

Things worth raising at your next appointment:

Not smiling socially by eight to ten weeks. Consistently not responding to sounds or loud noises. Not making eye contact or appearing to look through rather than at people. Limbs that feel consistently stiff or floppy rather than having normal muscle tone. Not lifting the head at all during tummy time by twelve weeks. Feeding difficulties that are persisting beyond the early weeks.

Things that warrant prompt contact with your child health nurse or GP:

A sudden loss of skills that your baby had previously acquired. This is called developmental regression and, unlike temporary variations in performance, a true loss of previously acquired skills warrants prompt assessment. Asymmetric movement where your baby consistently uses one side of their body more than the other. Any concern that feels urgent to you — your instincts about your baby matter.

Tummy time troubleshooting

Tummy time resistance is one of the most common parenting concerns in the first three months. If your baby consistently cries during tummy time, try the following before concluding they simply won't tolerate it.

Start smaller. Even 30 seconds of tummy time that ends before distress builds is more useful than a longer session that ends in crying. Gradually extend as your baby's strength develops.

Try different surfaces. Some babies tolerate tummy time on a firm floor mat better than on a soft surface. Others respond well to lying on your chest while you recline.

Make it interactive. Getting down on the floor at your baby's eye level and engaging with them during tummy time makes it more tolerable than being placed on the floor alone.

Time it well. A baby who is tired, hungry, or just fed is more likely to resist. Try tummy time when your baby is in a calm, alert state.

Your child health nurse appointments

Your child and family health nurse is your most accessible ongoing resource for development questions in the first year. Their appointments are specifically designed to monitor development, screen for potential concerns early, and provide parenting support. You do not need a specific concern to attend, and you should not feel that concerns are too minor to raise.

In Australia, child and family health nursing services are provided through state and territory health departments and are free. Your hospital or midwife will provide your initial referral or contact details at discharge.