Development Checks from Birth to Age 6

This guide covers ages 0 to 6. It explains monitoring using ages 1–3, with a separate section on what changes in babyhood (0–12 months) and the preschool years (3–6).

Between one and three, development rarely looks like a neat upward line. A toddler may add several words in one month and spend the next concentrating on climbing, feeding themselves, or pretend play. Illness, a new nursery, more than one home language, premature birth, hearing or vision difficulty, and major family changes can all affect what adults see on a particular day. A single snapshot—or a score found online—cannot describe the whole child.

First step: developmental monitoring is not a test or a diagnosis. Noting examples of your child’s play, communication and daily routines is a practical way to share a concern with a health professional if needed.

Use everyday observations alongside the broader development guide and the approach of observing in everyday life.

Noticing development in everyday life

Official source

Evidence context

Developmental monitoring helps identify children’s developmental needs within everyday care and supports planning when support is needed.

Everyday observation in three steps

The goal is not comparison; it is noticing real-life examples and sharing them when needed.

1. 1

   Observe

   Choose one concrete example from play, meals or communication.

2. 2

   Note

   Record the date, context and what your child did in a short sentence.

3. 3

   Share

   Bring changes that concern you to a routine health visit with examples.

Common misconception: every child should show a skill on the same date. A more helpful approach: look at patterns, strengths and change over time rather than one checklist.

The parent's role is not to reproduce a clinic in the living room. It is to notice change in ordinary routines, keep clear examples when something feels uncertain, and share them at child health reviews. In the UK, health visiting and GP pathways use scheduled contacts to discuss health, growth, learning and development; the exact service and timing can vary by nation and local area. A professional combines the family's account with observation, health history, examination and an appropriate tool when one is needed.

Monitoring, screening and diagnosis answer different questions

Developmental monitoring is the continuing process of following how a child changes over time. Conversation with caregivers, observation in familiar activities, previous records and the child's strengths all contribute. Developmental screening is a brief, structured check designed to identify whether closer assessment may be useful. A screen does not establish a condition. Diagnostic assessment is a clinical process that may include history, examination, hearing or vision information and input from more than one profession.

Knowing the difference prevents two common mistakes: panic because one box is unticked, and indefinite delay because “all children are different.” Do not download a professional questionnaire, calculate a score and treat it as a diagnosis. Standardised tools have age ranges, administration rules and thresholds; interpretation depends on health, language and context. If a review raises a concern, ask what the result means, what it does not mean, and what happens next.

Watch connected skills in ordinary routines

Developmental areas overlap. For communication, notice how the child uses gaze, gesture, sounds and words to share an interest or request help, and how they respond to simple language in different settings. For gross movement, watch changing ways of getting around, standing, walking, climbing and playing with a ball. For fine movement, examples include turning pages, placing blocks, making marks, and gradually managing a spoon or cup.

In relationships and play, notice shared attention, imitation, turn-taking, seeking comfort, curiosity and emerging pretend play. In self-help, look at participation in dressing, washing hands, mealtimes and transitions. These are not tasks to drill in one sitting. A hungry, tired, unwell or wary child may show far less than they can usually do. A pattern across play, books, meals, outdoors and childcare is more useful than a performance on request.

Compare the child with their own earlier pattern, not with a cousin or a nursery friend. Replace “doesn't talk” with a usable description: “For two weeks she has pointed to ask for a drink, uses three familiar words at home and none yet at nursery.” If the child hears or uses more than one language, describe communication across all of them. Word counts from one language alone do not capture gestures, understanding or the child's total language experience.

Build a short two-week observation record

Choose two or three behaviours related to your concern and note them briefly on different days. Include the date, setting, what happened before, what the child did without help, and what support changed the outcome. If a short video would show movement or interaction more clearly, protect the child's privacy and share it only through a route agreed with the relevant professional—not in family groups or social media.

At the end of two weeks ask: Is there new learning? Does the behaviour appear in more than one setting? Can the child do it with a small cue? The aim is not to produce a pass/fail chart, but to give the health professional a clearer timeline than “always” or “never.”

Use the child health review to agree a next step

Take the child's health and birth history, languages, care arrangements, recent changes and observation notes. Ask a specific question: “He has not added a new word for two months, but points and follows familiar instructions. Should hearing be checked, and what should we monitor before the next contact?” Hearing, vision, sleep, pain, nutrition and physical health can influence developmental behaviour, so a review should not focus on one milestone in isolation.

Ask for a plan you can repeat back: What exactly are we watching? Who will review it? By what date? Is a validated screen or referral appropriate? What change should make us return sooner? If the decision is to monitor, “wait and see” should still have a timeframe. Information from a nursery key person or another regular caregiver can help, with appropriate consent and limited sharing of the child's personal information.

Babies and ages 3–6: what changes in developmental monitoring?

Developmental monitoring works the same way at every age: notice concrete examples in daily life, write them down and share them at routine health visits. What changes is what you look at.

What to watch at each age:

• 0–12 months: Movement, reactions to sounds and faces, eye contact and smiling, sucking and feeding show up in everyday care. Routine baby checks include development too. For babies born early, use their corrected age rather than their birth date.
• Ages 3–6: Language and clear speech, cooperation in play and with other children, movement skills and independence in self-care such as eating, dressing and using the toilet come to the fore. A nursery or preschool teacher's observations add to your own.
• Hearing and vision: Not reacting to sounds, watching TV very loudly or squinting often are signs to mention at any age.
• Online tests: Online checklists can help you start a conversation, but they don't replace professional screening.

If your child loses a skill they already had (words, eye contact, walking), contact a health professional without waiting for the next check.

Treat red flags as a request for support, not a verdict

Loss of a previously acquired skill deserves prompt attention. Seek advice if a child stops using words or gestures they used before, loses movement or hand skills, or shows a marked reduction in social response or self-help. Repeated choking, breathing safety concerns, pronounced one-sided use, persistent mobility difficulty or concerns across several areas should not wait for a routine appointment. If you are worried, you do not need to prove a diagnosis before asking for an assessment.

Early support is not about attaching a label. It can identify a hearing or vision barrier, help the family adapt daily interactions, or connect the child with the right service while learning is highly active. Keep strengths in the record too: what captures the child's interest, how they initiate contact, and which cue helps. Developmental monitoring is most useful when it respects the child's pace without ignoring loss or persistent difficulty, treats parents as partners, and ends with a concrete next action.