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Baby health checks and developmental milestones

For babies from birth to 12 months · Development

Routine health checks in the first year of life are one of the most reliable tools parents have for making sure their baby is thriving. At each visit a health professional measures growth, screens hearing and vision, checks development, and administers immunisations. Between those appointments, a parent who notices patterns in their baby's feeding, sleep and behaviour is the best early-warning system available. This guide walks through what happens at each check-up, the milestones your baby is working toward month by month, and how to make every appointment count.

Why routine health checks matter

The first twelve months of life involve faster growth and more rapid brain development than any other period. The AAP (American Academy of Pediatrics) recommends a structured schedule of well-child visits precisely because problems caught early are almost always easier to address than problems caught late. Growth charts reveal nutritional concerns before they become serious. Developmental screening picks up delays that respond well to early intervention therapy. Immunisation schedules are designed so that babies are protected during the window when infectious diseases are most dangerous to them.

Routine checks also give parents a dedicated, unhurried space to raise concerns. A worry that might feel too small to call about during a busy week is exactly the right topic for a well-child visit. Health professionals actively want to hear about feeding difficulties, unusual crying patterns, sleep concerns and anything that feels different to you. You know your baby better than anyone, and your observations are clinical data.

The WHO, CDC and AAP all emphasise that no single measurement or skill tells the whole story. Health professionals look at the trajectory over time, the pattern of multiple data points together, and the child in the context of their family and environment. A well-child schedule is not a series of pass/fail tests; it is a relationship between a family and a care team built over months.

What health professionals look for at each visit

Weight, length and head circumference. These three measurements are plotted on a standardised growth chart at every visit. The WHO Child Growth Standards (birth to 5 years) and CDC growth charts (2 years and older) are the most widely used references worldwide. Health professionals look for consistent tracking along a growth curve rather than a specific percentile. A baby who drops across two or more major percentile lines on weight or height, or whose head circumference grows unusually fast or unusually slowly, will be assessed more closely.

Hearing. A newborn hearing screen should happen before hospital discharge or within the first month. If any concern is flagged, a full audiological assessment is arranged. Hearing is re-evaluated informally at each visit through response to voice and sound. Early identification of hearing loss dramatically improves speech and language outcomes because the brain is most receptive to language input in the first three years.

Vision. Health professionals check that the eyes are aligned, that the baby tracks a moving target, and that there are no physical abnormalities. By 6 months a full eye examination is recommended by the AAP. Parents should watch for asymmetric eye movement, persistent watering, cloudiness of the pupil, or lack of eye contact, any of which warrant an earlier referral.

Development. At every visit the health professional asks about and directly observes developmental milestones across four domains: motor skills (both gross and fine), language and communication, social and emotional development, and cognitive development. Standardised screening tools such as the Ages and Stages Questionnaire (ASQ) or the M-CHAT-R (for autism spectrum disorder) may be used at specific visits.

Immunisations. Vaccines are administered according to a schedule designed to provide protection as early as possible. The CDC publishes a recommended childhood immunisation schedule that is updated annually. Ask your health professional for the schedule relevant to your location, as national programmes differ. Keeping an accurate record of which vaccines have been given is important, especially if you change health providers or travel.

Physical examination. The health professional performs a head-to-toe physical check at each visit: fontanelle (soft spot) size and tension, ears, eyes, mouth and throat, heart and lung sounds, abdomen, hips, genitalia, skin, and reflexes. In the early months they check primitive reflexes such as the Moro and rooting reflex, which should fade as the nervous system matures.

Log your baby's weight, feeds, sleep and milestones when your baby arrives so every check-up appointment is well-informed.

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Key developmental milestones from 1 to 12 months

The following milestones are drawn from the CDC and AAP milestone resources and the WHO Multicentre Growth Reference Study. They represent what most babies achieve by a given age, not a fixed deadline. Every baby develops at their own pace, and premature babies are assessed against their corrected age (the age they would be if born at full term).

1 month

Your baby can briefly lift their head when placed on their tummy. They startle at loud sounds, respond to your voice by quietening or turning toward you, and focus on faces held about 20 to 30 centimetres away. They may show a fleeting smile, though the reliable social smile comes later.

2 months

The social smile arrives: your baby grins in response to your face and voice. They hold their head up more steadily during tummy time, start to make cooing sounds, and follow a moving object with their eyes. They recognise their primary caregiver's voice and find it soothing.

3 months

Babies at 3 months open and shut their hands, bring their hands to their mouth, and swipe at dangling toys. They hold their head steady when upright and may push up on their forearms during tummy time. Vocalisations become more varied, including long vowel sounds and simple "talks" back and forth with a caregiver.

4 months

By 4 months most babies can hold their head steady without support when carried, push up onto straight arms during tummy time, and roll from front to back. They reach for and grasp objects deliberately, bring objects to their mouth, and laugh out loud. They show clear preferences for familiar faces and may show stranger wariness.

6 months

A 6-month-old can typically sit with minimal support, roll both ways, and bear weight on their legs when held upright. They pass objects between hands, reach with one hand, and explore everything with their mouth. Babbling begins, strings of consonant-vowel sounds such as "ba-ba" and "da-da," though these are not yet used meaningfully. They recognise their own name and turn toward it.

9 months

By 9 months most babies sit independently, crawl or find another way to move around the room, and pull to stand holding furniture. They use a pincer grasp (thumb and index finger) to pick up small objects. They understand "no," wave bye-bye, and clearly prefer their caregivers over strangers. They may say one or two words but babble constantly.

12 months

At 12 months many babies take their first steps or are on the verge of walking. They point to things they want, shake their head for "no," and say at least one word with meaning. They can follow a simple one-step instruction ("give me the cup"), look for a toy they watched you hide, and imitate actions such as banging or stirring. They drink from a cup and use a spoon with help.

Red flags that warrant developmental referral

The following observations, if present, should be raised with a health professional promptly. They do not necessarily mean something is wrong, but they deserve timely evaluation. Early intervention services are far more effective when started early in childhood.

The CDC's "Learn the Signs. Act Early." programme provides free milestone checklists you can complete at home and discuss with your health professional. Acting early, even when you are unsure, is always the right instinct. A referral for a developmental assessment does not mean something is definitely wrong; it means your baby will be evaluated by a specialist who can either reassure you or connect you to the right support.

Growth chart basics and immunisation

Growth charts plot your baby's weight, length and head circumference against data from large groups of healthy children. The WHO Child Growth Standards, published in 2006, are based on children raised in six countries under optimal conditions including breastfeeding, non-smoking environments and good healthcare. They are now used as the international reference for children from birth to 5 years.

A percentile line on a growth chart means that a certain proportion of babies of the same age and sex fall below that measurement. Being on the 10th percentile for weight is not a problem if a baby has always tracked along the 10th percentile. What concerns health professionals is a significant drop across multiple lines over a short period, which can indicate inadequate nutrition, illness or other issues.

Immunisation in the first year typically covers protection against hepatitis B, rotavirus, diphtheria, tetanus, pertussis, Haemophilus influenzae type b, pneumococcal disease, polio, and influenza (from 6 months). The exact vaccines and timing depend on the national schedule where you live. Keeping a written record of every vaccine given, including the date, brand and batch number, protects your baby if records are ever lost. Your Cubby app is a convenient place to log this alongside growth and feeding data.

What to bring and how to prepare

Appointments move faster than expected. Preparation makes them more useful. Before each visit, write down any questions you have been saving since the last appointment. Common topics include feeding (volume, frequency, introducing solids after 6 months), sleep patterns, skin concerns and behaviour changes. If you have been tracking feeds, nappy output and sleep in an app, you can show that data directly to the health professional. A week of feeding logs is far more useful than a rough estimate from memory.

Bring the following to each appointment: your baby's health or immunisation record book if one was provided; a list of any medications your baby takes including supplements; and a written list of your questions ranked from most to least important. Dress your baby in easy-to-remove clothing because they will need to be weighed undressed and examined in detail.

At immunisation visits, plan to soothe your baby at the breast or with a bottle immediately after the injections if possible. Research cited by the WHO supports skin-to-skin contact and feeding as effective pain management during and after vaccination in infants. Ask the health professional what mild reactions to expect (low-grade fever, redness at the injection site, irritability) and when to seek additional care.

Supporting development between appointments

Health checks happen every few weeks to months, but development happens every day. The most powerful thing parents can do between appointments is engage in responsive caregiving: talking to their baby, responding to cries and coos, making eye contact, reading aloud, singing and playing. The AAP describes this as "serve and return" interaction, where a baby initiates (a look, a sound, a gesture) and a caregiver responds. These exchanges literally shape the neural architecture of the developing brain.

Tummy time, for a few minutes several times a day from birth, strengthens the neck, shoulder and core muscles needed for rolling, sitting and eventually walking. Babies who spend supervised time on their tummy while awake reach motor milestones more comfortably than those who are always on their back or in a seat. The safe-sleep guidance from the AAP and CDC is clear: babies sleep on their back on a firm flat surface, but tummy time happens while they are awake and watched.

Limiting screen time entirely in the first 18 to 24 months (except video calls with family) is recommended by both the AAP and WHO. This is not because screens are inherently harmful but because every screen minute replaces a serve-and-return interaction. Language, problem-solving and emotional regulation all develop faster through live human interaction than through passive screen viewing at this age.

Reading together, even to a newborn, exposes babies to vocabulary and the rhythm of language far in advance of when they can speak. A baby who hears thousands of words daily in meaningful context builds a bigger language foundation than one who hears fewer. Libraries, community programmes and your health professional's office can all be good sources of free books and reading programmes for infants.

Frequently asked questions

How often should my baby have routine health checks in the first year?

The AAP recommends well-child visits at 1 month, 2 months, 4 months, 6 months, 9 months and 12 months during the first year of life. Some providers also schedule a newborn visit within the first week after discharge from hospital. Missing a visit is not a disaster, but keeping to the schedule helps catch any concerns early and keeps immunisations on track.

What measurements does a health professional take at each baby check-up?

At every well-child visit the health professional typically measures weight, length (height lying down), and head circumference. These three numbers are plotted on a WHO or CDC growth chart to track your baby's growth trajectory over time. A healthy baby does not need to sit on any particular percentile; what matters most is that growth follows a consistent curve. Sudden drops or jumps across multiple percentile lines are worth discussing with your doctor.

When should babies first have their hearing and vision checked?

A newborn hearing screen is recommended before hospital discharge or within the first month of life, according to the CDC and AAP. Vision is assessed at every well-child visit, with a full eye exam recommended by the age of 6 months. If your baby does not track a moving object with their eyes by 3 months or does not make eye contact, let your health professional know at the next visit.

What are the most important developmental red flags in the first 12 months?

Red flags that warrant prompt discussion with a health professional include: no social smile by 2 months; no babbling or cooing by 4 months; not reaching for objects by 6 months; not sitting without support by 9 months; no first words by 12 months; loss of any skill already achieved at any age. The CDC's "Learn the Signs. Act Early." programme has free milestone checklists you can print and bring to appointments.

How can I prepare for a baby health check-up?

Write down any questions or concerns before the visit so you do not forget them in the moment. Bring your baby's health record booklet or immunisation record. If you track feeds, sleep, wet nappies and growth in an app, bring that data too as it gives the doctor a fuller picture between visits. Dress your baby in clothes that are easy to remove for weighing and physical checks. Note any changes in behaviour, feeding or sleep since the last appointment.

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