How to read a milestone list
Four things make the difference between a list that is useful and a list that is upsetting.
The ranges are wide, and the midpoint is not a target. When a list says most babies roll by seven months, it is describing a span that starts at three or four months for some babies and ends later than seven for others. The figure is a description of a population, not an expectation of an individual.
Development is uneven across areas, and that is normal. A baby well ahead on movement and unremarkable on sounds is the usual pattern rather than a trade-off. Babies concentrate on one thing at a time, and the one they are not working on appears to stall until they come back to it. A baby who has just started walking very often goes quiet for a few weeks.
For a baby born early, the ages are counted from the due date. This is not a courtesy adjustment — it is how development actually works, and it is how services apply the thresholds below. A baby born two months early is, developmentally, two months younger than the calendar says, and remains so for at least the first couple of years. Measuring such a baby against their birth date produces alarm about a baby who is doing exactly what they should.
The direction of travel matters more than the dates. A baby who is slower than average but steadily accumulating new skills is a different proposition from one whose progress has stopped, and an entirely different proposition from one who has lost something they could previously do. The second and third are worth a conversation whatever the dates say.
One further point, because it does real damage. Reassurance of the form that some famous figure spoke late is the most common reason a genuine delay goes unexamined for a year. Most late talkers do catch up without help; the purpose of raising it early is to identify the minority who will not, at the age when help works best. Asking costs nothing and rules nothing out.
The first month
Newborn movement is largely reflex. Hands come to the mouth, which is how a new baby explores almost everything, and the head turns from side to side — the first signs of muscle control rather than pure reflex.
Focus at this stage sits at roughly 20 to 30 centimetres, about the distance to the face of whoever is holding the baby. The eyes wander, but not randomly: they are drawn to high-contrast patterns and, far more than to anything else, to faces. A newborn blinks at a bright light.
Sounds produce a reaction — a startle at a loud one, attention turned towards a voice, and often a visible settling at a familiar one.
Three screening checks belong to this period. A physical examination within 72 hours of birth looks at the eyes, the heart and the hips, and the testicles in boys. The newborn hearing screen is usually done in the first few weeks. The blood spot test, taken from the heel at around five days, screens for a group of rare but treatable conditions.
Two to three months
Muscle work becomes visible. During time on the tummy the head lifts, and then the chest a little with it. Fists open and close as control over the hands and arms arrives, and a baby lying down will push down with the feet.
Vision sharpens considerably. By around three months a baby will watch a face with real concentration and follow a moving object deliberately rather than by chance, and the first hand-eye coordination appears: a hand that goes roughly where the eyes are looking.
The social smile arrives in this window, and it is distinct from the fleeting smiles of the first weeks — it is a response to a person. Enjoyment of company, and the first stirrings of copying what others do, start here too.
The physical examination done after birth is offered again by the GP between six and eight weeks. Separately, the health visiting team holds a review at around the same point, which is as much about how the adults are doing as the baby.
Four to six months
Rolling begins somewhere in here — as early as three or four months for some babies, with most rolling by about seven months. It tends to arrive in one direction first, and it changes what a room needs to look like, since a baby left on a raised surface is now a baby who can get off it.
Reaching and grasping become purposeful, and everything within range goes to the mouth. Sitting arrives in stages: propped, then briefly unsupported, then steadily. Signs of sitting should be there by around eight months.
Colour vision is complete and distance vision good enough to recognise a familiar person across a room and track them as they move. Sounds become babble — strings of repeated consonants, with the rhythm and turn-taking of conversation long before any of it means anything.
Six to nine months
Sitting becomes solid, and then mobility follows in whatever form the individual baby invents. Crawling on hands and knees is only one option: bottom-shuffling, rolling across a room, wriggling forwards on the tummy and pushing backwards are all ordinary, and a minority of babies go straight from sitting to pulling up and walking without crawling at all.
Pulling to stand against furniture usually appears towards the end of this period. The grasp refines from a whole-hand scoop towards finger and thumb, which is precisely when small objects on the floor stop being scenery and become a hazard.
Understanding runs well ahead of speech. A baby of this age generally turns to their own name, grasps that a particular tone means stop, and has worked out that an object still exists when it goes out of sight — which is what makes peekaboo funny and makes being left in a room not funny at all.
Nine to twelve months
Cruising along furniture comes first for most babies, and first steps anywhere between about nine and eighteen months. Walking later than average within that span says nothing on its own.
Pointing appears somewhere between twelve and eighteen months and is one of the more informative items on any list, because it is not a muscle skill. A baby who points at something to make an adult look at it too has grasped that other people have attention worth directing — which is the foundation that language is built on.
First words arrive around the first birthday, and the babbled sounds that resembled words for months start being used for specific people. Waving, clapping and copying gestures come in alongside.
So does preference. Wanting one particular toy and firmly not another, and objecting when the choice goes the other way, is cognitive development rather than naughtiness — and it is the first appearance of the collision between what a small child wants and what the adults have planned, which goes on to occupy the next few years.
The reviews, and what they are for
Health visiting in England offers a set schedule of contacts, with equivalents across the other UK nations:
- An antenatal contact in late pregnancy, introducing the service.
- A new birth visit at around 10 to 14 days, usually at home.
- A review at six to eight weeks, covering how the household is managing as much as the baby.
- A one-year review, generally between twelve and fifteen months.
- A two-year review, generally between twenty-four and thirty months, covering communication, gross motor skills, fine motor skills, problem solving and personal-social skills.
- A school readiness check at three to four years, after which a child transfers from health visiting to school nursing.
The one-year and two-year reviews normally come with a questionnaire sent out beforehand to be completed at home and brought along. It is worth saying plainly what that questionnaire is for: it is a screening tool, not a test of parenting, and the only way to make it useless is to answer it generously. A difficulty recorded accurately is a difficulty that gets looked at. One rounded up is one that waits another year.
For anything to do with development, the health visitor is the first port of call rather than the GP, and a review does not have to be waited for. Health visiting teams take concerns between appointments as a matter of routine.
When to ask rather than wait
These are the specific signs that UK services list as worth looking at. None of them is a diagnosis, and most turn out to be nothing — identifying the few that are not is the entire point. For a baby born early, every age here is counted from the due date.
Movement and posture
- Very floppy, or persistently poor head control.
- Not sitting by eight months.
- Not walking by eighteen months.
- A clear hand preference before the first birthday. Handedness settling that early suggests the other hand is not working as well, rather than a precocious preference.
- One side of the body consistently doing less than the other, or an asymmetric posture.
- Standing or walking on tiptoe and seeming unable to put the foot flat.
- Jerky or twitchy movements, or limbs that feel stiff or markedly floppy to handle.
Hearing, vision and communication
- Not babbling by twelve to fifteen months.
- No first words by eighteen months.
- Not appearing to understand some of what is said by eighteen months.
- Not reacting to sound, or not turning to their own name.
- An eye that persistently turns in or out, or eyes that do not follow a face or an object.
At any age, whatever else is or is not happening
- Any loss of a skill a baby previously had. Words that have gone, a baby who sat and no longer sits, a baby who engaged and has stopped. This is the one item on the list with no age attached to it, and the one that should not be saved for the next review.
- Progress that has stopped rather than slowed, with no new skills appearing over a long stretch.
- A settled sense among the people who know the baby best that something is not right, even where nothing above matches. That is how a great deal gets picked up, and it is treated as a reason for a proper look rather than as fussing.
What a list cannot cover
Nothing on any milestone chart is advanced by equipment. What babies need in order to practise is floor, time and attention: being talked to and sung to through ordinary activity, being read to long before any of it is understood, being allowed to struggle briefly with something just out of reach, and spending waking time somewhere they can move rather than strapped into something.
Which is the argument against a day spent in seats, bouncers and walkers — not that they are harmful in small doses, but that they are time not spent doing the thing. Baby walkers in particular are not recommended, for reasons covered under falls and head injuries in children.
Running alongside the first year, teething accounts for a good deal of the broken sleep and general misery, and for several of the things that get mistaken for it.