The 18-month developmental check: what happens and what to expect
The 18-month check is one of the most important early childhood health appointments in the UK, and it arrives at a stage when your toddler is changing fast. Parents often search for it in the days before the visit, hoping to understand what the health visitor is looking for and what they should be ready to say. This guide walks through everything the check covers, how to prepare, and what happens if a concern is raised.
What the 18-month check is
The 18-month review is a routine health and development check carried out as part of the NHS Healthy Child Programme. It is offered to all children in England, Wales, and Northern Ireland, and is usually led by a health visitor. In practice, the timing varies: appointments often happen anywhere between 16 and 24 months depending on where you live and how busy local services are. If you have not heard from your health visiting team by the time your child is 18 months, it is reasonable to contact them proactively.
The check is not a test your toddler can pass or fail. It is a review and a conversation, designed to make sure your child is developing well and to identify anything that would benefit from support early. Health visitors are trained to look across several developmental areas at once, and they understand that toddlers rarely perform to order in an unfamiliar setting.
Your role in the check is as important as anything the health visitor observes directly. The examples you give of what your toddler does at home are genuine clinical evidence, not just parent reassurance. Come prepared to share specific things you have noticed.
What is reviewed at the check
Movement: gross motor and fine motor skills
By 18 months, most toddlers are walking independently and some are beginning to run, though running is often more of a fast, slightly unsteady trot at this stage. The health visitor will ask whether your toddler is walking, how steady they are, and whether they can manage stairs with support. If walking has not yet started, this will be one of the key things to follow up.
For fine motor skills, the health visitor will be interested in whether your toddler can pick up small objects, stack a few blocks (two or three is typical at this age), and manage a spoon at mealtimes, even if the aim is imperfect. These skills reflect how well the small muscles in the hands and the connections between eye and hand are developing.
Communication and language: the main focus at 18 months
Language is the primary developmental concern at this age and the area the health visitor will spend the most time on. The AAP 2022 milestone guidelines and the RCPCH both describe around six words as a reference point for 18 months, though what matters as much as the count is the broader picture of communication.
The health visitor will ask:
- How many words does your toddler say clearly and consistently?
- Is your toddler pointing at things to share interest with you, not just to request something?
- Does your toddler wave hello and goodbye?
- Does your toddler follow simple one-step instructions, such as "bring me the ball" or "put it in the box"?
- Does your toddler understand simple questions, such as "where's your cup?"
A toddler who has only three or four clear words but is pointing enthusiastically, following instructions, and babbling with intent is showing that the communication system is broadly on track. A toddler who has several words but is not yet pointing or following instructions may benefit from a closer look. The full picture matters more than any single number.
Hearing
The health visitor will often check hearing informally during the appointment, for example by calling your toddler's name from across the room and watching for a response. If there is any concern, whether you have noticed your toddler not responding to sounds, turning up the television, or seeming to miss what you say, the health visitor can refer to audiology for a formal hearing assessment. Mentioning even a mild concern about hearing is always worth doing at this check.
Vision
Formal vision testing is not usually part of the 18-month check, but the health visitor will ask whether you have noticed any concerns about how your toddler sees. Things worth mentioning include a squint (one eye turning in or out), excessive blinking, or any signs that your toddler has difficulty seeing objects at a distance or up close. If there is a concern, a referral to an orthoptist or ophthalmologist can be arranged.
Social and emotional development
The health visitor will ask about how your toddler interacts with familiar people and how they respond in social situations. At 18 months, most toddlers recognise and clearly prefer familiar people, show separation anxiety when a parent leaves the room, play alongside other children rather than with them (this is normal at this age), show affection to family members, and respond to the emotions of those around them.
Early signs of social communication to look for include whether your toddler makes eye contact naturally, shares their interest in things with you by looking between an object and your face, and responds to their name. If these are absent or very limited, it is worth mentioning.
Physical measurements
Your toddler's height and weight will usually be measured and plotted in the Red Book. The health visitor will look at how these measurements relate to earlier readings and whether the growth curve is following a consistent pattern. A single measurement tells you very little on its own; the trend over time is what matters. If there are any concerns about growth, the health visitor will advise whether further investigation is needed.
Immunisations
The health visitor will check your toddler's immunisation record to make sure all jabs due around this age have been given. These include the first MMR (measles, mumps and rubella, typically offered at 12 to 13 months), the MenB booster (12 months), and the Hib/MenC booster (12 months). If any vaccinations have been missed or delayed, the appointment is a good opportunity to arrange these. There is no penalty for being behind schedule, and catch-up is always possible.
Age-appropriate safety
The health visitor may ask a few questions about home safety that are relevant to this age group. Toddlers at 18 months are mobile, curious, and have no reliable sense of danger, which creates specific risks. The areas typically covered include falls (stair gates, furniture they can climb), button batteries (which are extremely dangerous if swallowed and must be completely inaccessible), drowning risk (even shallow standing water), and road safety near the home. These are not questions designed to catch you out; they are prompts to check that safety basics are in place.
Your own wellbeing
A good health visitor will ask how you are doing, not just how your toddler is doing. Postnatal depression can persist well beyond the first few months, and parenting a toddler is tiring and sometimes isolating work. The Edinburgh Postnatal Depression Scale may be used again at this check. If you have been struggling emotionally, this is a safe space to say so. Support exists and asking for it is not a sign of failure.
What to bring to the appointment
Bring your child's Red Book, the personal child health record you received after your toddler was born. The health visitor needs this to check immunisation records, plot measurements, and review earlier entries. If you have lost your Red Book, let the health visitor know when you arrive so they can look up records another way.
Write your questions down before the appointment. It sounds simple, but it is genuinely easy to forget the things you most wanted to ask once you are in the room with a wriggly toddler. If you have been wondering about something, write it on your phone or a piece of paper and take it with you.
Bring a small snack and something familiar for your toddler to hold or explore. A hungry or bored toddler who has been sitting still for ten minutes is much less likely to demonstrate anything you want them to show. A snack and a favourite small toy can make the second half of the appointment considerably smoother.
What if your toddler doesn't perform on the day
This is one of the most common parental worries before the check, and it is worth setting your mind at rest: health visitors are experienced with exactly this scenario. Toddlers routinely clam up, refuse to engage, stare blankly at blocks they can stack at home, or simply sit there eating the snack you brought. This is expected behaviour in a new environment with an unfamiliar adult.
Your account of what your toddler does at home is genuine, useful, and given full weight by the health visitor. The more specific you can be, the better. Rather than "she talks quite a bit", say "she uses about ten words clearly: mama, dada, ball, dog, no, bye, more, up, cup, and she says something that sounds like her brother's name." Rather than "he understands instructions", say "he brings his shoes when I ask him to, and he points at the dog every time we walk past." These specifics give the health visitor real information to work with.
If the health visitor cannot get a clear picture on the day because your toddler will not cooperate, they may arrange a follow-up appointment rather than drawing a firm conclusion from limited information. This is appropriate practice, not a sign of concern.
Preparing for the visit: examples to have ready
In the days before the appointment, it is worth paying deliberate attention to what your toddler is doing so you arrive with recent, specific examples. Here are the areas to observe:
- Words: Count the words your toddler uses consistently and clearly. Include words in any language if your family is bilingual.
- Pointing: Does your toddler point at things to share interest with you, not just to reach? For example, pointing at an aeroplane in the sky just to show you, rather than pointing at a biscuit to request it.
- Following instructions: Try a simple one-step instruction without gesturing and see what happens. "Go and get your shoes" or "put the cup on the table."
- Walking: Note whether your toddler is walking confidently, beginning to run, or still unsteady. Whether they can manage one or two stairs with support.
- Fine motor: Whether they can pick up small objects with their fingers, manage a spoon at mealtimes, or attempt to stack a couple of blocks.
- Social: Whether they wave, whether they look back at you when something interests them, whether they make eye contact with familiar and unfamiliar people.
You do not need to prepare a formal report. A handful of clear, recent examples across these areas is plenty.
What happens if a concern is raised
If the health visitor thinks a closer look would be helpful, they will suggest a referral to the relevant service. The most common referrals from the 18-month check are:
- Speech and language therapy (SALT): for concerns about language development, including limited words, absence of pointing, or difficulty following instructions.
- Audiology: for any concern about hearing, including informal observations during the appointment or things you have noticed at home.
- Developmental paediatrics: for broader concerns about development across more than one area, or for concerns about social communication.
- Orthoptics or ophthalmology: for any concern about vision, eye alignment, or how your toddler sees.
An early referral is not a verdict. It is the health visitor doing their job well and making sure your toddler gets a proper look from someone with specialist expertise. Many children who are referred go on to need no further support once they have been assessed. And for those who do need support, earlier is genuinely better. The referral is a good thing to receive.
If you leave the appointment feeling unsettled by something that was said, or unsure what happens next, contact your health visiting team. You are entitled to understand the process and what to expect.
The UK check compared to the US well-child visit
If you are from the US, or have family or friends there, you may be familiar with the 18-month well-child visit, which is the American equivalent. The content is broadly similar: motor development, language, social and emotional development, physical measurements, and immunisations. In the US, the paediatrician may use the Ages and Stages Questionnaire (ASQ-3), a structured parent-completed screening tool, at or around this age. The AAP 2022 milestone revision updated the expected milestones at 18 months to reflect broader population data, and the guidance now includes pointing, waving, and following two-step instructions as key markers at this age alongside vocabulary count.
The main practical difference is that in the US the appointment is typically with a paediatrician rather than a health visitor, and the screening tends to be more structured. In the UK, the relationship with the health visitor is designed to be ongoing and supportive rather than purely clinical. Both systems are doing the same work: making sure children are developing well and identifying anything that benefits from early help.
Frequently asked questions
What happens at the 18-month developmental check?
The 18-month check is a routine health and development review carried out by a health visitor as part of the NHS Healthy Child Programme. It covers gross and fine motor development, communication and language (the main focus at this age), social and emotional development, hearing and vision, physical measurements, immunisation status, age-appropriate safety, and your own wellbeing as a parent. It is a conversation, not a test. Your observations of what your toddler does at home carry as much weight as anything the health visitor observes in the room.
What if my toddler won't do anything at the appointment?
Health visitors are experienced with toddlers who clam up, refuse to engage, or behave completely differently in an unfamiliar setting. Come prepared with specific examples of what you have seen at home: "she waves bye-bye every time someone leaves", "he points at dogs when we're out on walks", "she has about ten words she uses reliably." Your account of your toddler's everyday behaviour is valid clinical information, and a good health visitor will prioritise it over a snapshot of what your toddler does under pressure in a strange room.
How many words should my toddler have at 18 months?
The AAP 2022 guidelines and RCPCH both reference around six words as a guideline for 18 months, though the range in practice is wide. The health visitor is looking at the broader communication picture alongside word count: whether your toddler is pointing to share interest, following simple instructions, engaging socially, and babbling with intent. If your toddler has fewer than six clear words and is not yet pointing or following simple requests, mention this at the check so the health visitor can advise whether a speech and language therapy referral would be helpful. Earlier is always better when it comes to SALT support.
What if my health visitor has concerns?
They will suggest a referral to the relevant specialist. For communication concerns, this is usually speech and language therapy (SALT). For hearing, audiology. For broader developmental questions, a developmental paediatrician. For vision, an orthoptist. An early referral is not alarming. The whole point of the check is to identify anything that would benefit from specialist support while early intervention can make the most difference. Many children referred after the 18-month check need no further support once properly assessed. For those who do, being referred early is genuinely better than waiting.
What should I bring to the 18-month check?
Bring your child's Red Book (personal child health record), any questions you want to raise written down in advance, and something familiar for your toddler such as a favourite small toy or a snack. A snack can help settle a toddler who is getting restless mid-appointment. Writing your questions down beforehand is genuinely useful: it is very easy to forget in the moment the things you most wanted to ask.
How is the 18-month check different from the 2-year review?
The 18-month check focuses particularly on early language and communication, walking, fine motor skills, and social development, as these are the areas where early support makes the biggest difference at this age. The 2-year review (usually offered at two to two-and-a-half years) builds on this with a broader developmental picture, often using a structured questionnaire such as the Ages and Stages Questionnaire (ASQ). If the 18-month check raises any concerns, the 2-year review is an important follow-up point. You do not have to wait until then to act on a concern, though: contact your health visiting team or GP at any point if something is worrying you.
Log your toddler's milestones as they happen
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