Medical Information
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toddlerToddler Milestones 12–24 Months: What to Expect and When to Ask for Help
A month-by-month guide to developmental milestones between 12 and 24 months across language, motor, social, and cognitive domains, with the red flags that always warrant a health visitor referral.
Toddler Milestones 12–24 Months: What to Expect and When to Ask for Help
The second year of life brings more visible change than almost any other period in childhood. A baby who crawls into their first birthday can be running, talking, and demanding their own shoes by their second. Understanding what development looks like across these twelve months helps parents know when things are on track — and when something is worth discussing with a doctor.
The American Academy of Pediatrics (AAP) is clear that milestones are ranges, not deadlines. Children develop at different rates, and hitting a skill a few months later than average is often within normal variation. What matters is the direction of progress — skills should accumulate over time, not plateau or disappear. Any loss of skills a child previously had is always a red flag, regardless of age.
This guide covers the four main developmental domains across the 12 to 24 month period: language, motor, social and emotional, and cognitive.
Fact-Checked & Transparent: This article is fact-checked against current CDC, WHO, ACOG, and NHS guidelines. All health information is based on authoritative medical sources. Last verified: June 2026.
⚠️ MEDICAL DISCLAIMER
This article is educational information only. It is NOT a substitute for professional medical advice, diagnosis, or treatment.
Always consult your pediatrician or healthcare provider before making any medical decisions for your baby or child. Every baby is unique, and professional medical guidance is essential.
In case of emergency, call 911 or your local emergency number.
12 Months
Language
Most 12-month-olds have one or two meaningful words beyond "mama" and "dada" — used consistently and with clear intent, not just as sounds. They understand many more words than they can say. Pointing to request objects and to direct adult attention is well established. Responding to their own name is reliable.
Motor
Most children are either taking their first independent steps or pulling to stand and walking while holding furniture (called cruising). Both are within normal range at 12 months. The early walker often has a wide stance and holds their arms high — this is a normal balance strategy, not a sign of anything amiss.
Fine motor skills at 12 months include a well-established pincer grip (picking up small objects between thumb and index finger tip), intentional release of objects, and the ability to put objects into a container and retrieve them.
Social and Emotional
Social referencing is well developed — looking at a parent's face before engaging with a stranger or approaching something unfamiliar to gauge whether it is safe. Waving bye-bye on request, clapping on request, and imitating simple actions are typical. Separation anxiety, which can be intense at this age, is a sign of healthy attachment rather than a problem.
Cognitive
Object permanence — understanding that an object continues to exist even when out of sight — is established by 12 months. Following a one-step instruction ("come here," "give me that") is achievable. Cause-and-effect play is actively enjoyed: pressing buttons, banging objects, dropping things to hear the sound they make.
15 Months
Language
By 15 months, most children have between 5 and 10 words. Pointing to share interest — not just to get things but to show a parent something interesting — is an important milestone at this age. Comprehension continues to outpace expression significantly.
The NHS identifies no pointing by 15 months as a red flag warranting a GP referral, as pointing to show interest (protodeclarative pointing) is a key indicator of social communication development.
Motor
Walking independently is typical by 15 months, though falls remain frequent. Children this age can squat, pick something up from the floor, and return to standing — a useful sign of leg strength and balance. Stacking two blocks is achievable.
Social and Emotional
Parallel play — playing near other children without interacting with them — is the norm at 15 months. Children this age are intensely interested in other children but do not yet know how to engage. Imitating household tasks begins: sweeping, wiping, "cooking."
Cognitive
Simple shape sorters with large, distinct shapes become manageable. Following two-step instructions that are related ("pick up the ball and put it in the box") is developing. Preferences for particular toys and activities become clear.
18 Months
Language
Between 10 and 25 words is typical at 18 months, though there is considerable variation. Children this age can point to named body parts (nose, eyes, tummy) when asked. Understanding two-step instructions is solid.
The AAP and NHS both identify 18 months as a key checkpoint for language. Fewer than six words at 18 months, or no pointing to share interest, should prompt a referral.
Motor
Running appears around 18 months — initially with a stiff-kneed, wide-legged gait and frequent falls. Walking up stairs with support (one foot per step, holding a rail or hand) is typical. Fine motor skills include scribbling with a crayon using a whole-fist grip, and stacking 3 to 4 blocks.
Social and Emotional
Pretend play is beginning at 18 months — feeding a doll, talking into a toy phone, "cooking" in a toy kitchen. This is a significant cognitive milestone as well as a social one. Emotional regulation is limited; tantrums are normal and reflect neurological immaturity rather than a behaviour problem.
Cognitive
Simple two-piece puzzles and shape sorters are manageable. Pretend play is the major new cognitive development: the ability to use one object to represent another (a block becomes a car) indicates that symbolic thought is underway.
21 Months
Language
Vocabulary reaches up to 50 words for many children, though wide variation is normal. Short back-and-forth exchanges — pointing, responding, pointing again — lay the groundwork for later conversation.
Motor
Motor skills become more coordinated. Kicking a stationary ball forward is typical, as is climbing stairs with support. Jumping — with both feet leaving the ground — is beginning to develop in some children.
Social and Emotional
Children begin watching other children more closely and showing interest in joining in. Cooperative play is still rare, but the social interest that will underpin it is growing.
Cognitive
Pretend play becomes more elaborate. Children this age can follow a short sequence of pretend actions — setting a table, serving food, eating — rather than isolated pretend actions.
24 Months
Language
By the second birthday, the vocabulary milestone shifts from individual words to combinations. Two-word phrases — "more milk," "daddy go," "big dog" — indicate that grammar is beginning to develop. The AAP identifies 50 or more words and two-word phrases as expected milestones at 24 months. The NHS notes that most children of this age will use at least 50 words regularly and combine two or more.
Motor
Most 24-month-olds run with confidence. Jumping with both feet leaving the ground is typical. Stacking 6 or more blocks is achievable. Turning single pages of a regular book (not just board book pages) is developing.
Social and Emotional
Brief cooperative play — joining another child in a simple shared activity — begins around 24 months. Turn-taking in simple games is emerging. Children this age are increasingly aware of other people's feelings, though their own emotional regulation remains limited.
Cognitive
Imaginative play takes off. Simple two-piece puzzles are easy; 4-piece puzzles are manageable. Following two-step instructions that are not closely related ("go to your room and get your teddy") is reliable.
The Two-Year Developmental Check
In England, the NHS mandates a two-year developmental check carried out by a health visitor. This covers language, motor development, social communication, hearing, vision, and growth. The check is designed to identify children who need referral for specialist assessment before they start pre-school.
Parents should not wait for this appointment to raise concerns. If something feels off between scheduled checks, a phone call to the GP practice or health visitor is always appropriate. Early referral — even if it turns out to be unnecessary — is preferable to delayed identification of a difficulty.
Red Flags That Are Never "Wait and See"
Some milestones are time-sensitive in a way that warrants prompt professional review rather than watchful waiting:
- Not walking independently by 18 months
- Fewer than 6 words by 18 months, or no words at 16 months
- No two-word phrases by 24 months
- No pretend play by 24 months
- No pointing to show interest by 15 months
- Any loss of skills previously present, at any age — this is always an urgent referral
The loss of previously acquired skills in particular should never be attributed to a developmental plateau or regression without medical review. While brief regression during periods of stress (a new sibling, a house move) can occur and resolve, unexplained loss of skills warrants the same prompt attention as any other developmental red flag.
How to Support Development in the Second Year
Research consistently shows that the quality of interaction matters more than any toy or programme. Talking throughout the day — narrating what you are doing, naming objects, asking simple questions — builds language more effectively than screen exposure. The NHS and AAP both emphasise that back-and-forth interaction with a responsive adult is the single most powerful driver of early language development.
Reading aloud daily, even briefly, develops vocabulary and attention span. Physical books, board books, and simple story books with repetitive language are all suitable. Outdoor time supports gross motor development and sensory processing. Unstructured play with simple materials — blocks, containers, sand, water — drives cognitive growth in ways that structured programmes cannot replicate.
One important note: a child who is progressing, even at the slower end of the typical range, is generally developing normally. The concern is not where a child sits within the range at any given moment, but whether they are continuing to move forward.
Frequently Asked Questions
My child has 30 words at 18 months but isn't putting two words together yet. Should I be concerned?
A vocabulary of 30 words at 18 months is within the typical range (the AAP expects 5 to 10 words at 15 months and 50 or more by 24 months). Two-word combinations typically emerge between 18 and 24 months. At 18 months, the absence of two-word phrases is not in itself a red flag — the expectation for combinations is at 24 months. Continuing to model two-word phrases ("more milk," "big dog") in conversation supports this next step. If your child does not have two-word combinations by 24 months, that warrants a referral.
What is social referencing and why does it matter?
Social referencing is the behaviour of looking at a parent's face before engaging with something unfamiliar — a new person, an unusual object, an unexpected event — to gauge whether it is safe or interesting. It reflects the child's understanding that adults hold information about the world and that their emotional reaction is a guide. Social referencing is well established by 12 months in typical development. Absence of this behaviour, alongside lack of pointing to share interest, is a recognised early sign of social communication difficulty.
My toddler has tantrums several times a day. Is that normal?
Yes. Frequent tantrums in the second year of life are developmentally expected. The part of the brain responsible for emotional regulation — the prefrontal cortex — is the last area to mature, not reaching full development until the mid-twenties. A 18-month-old experiencing overwhelming emotion has very limited capacity to regulate it. Tantrums peak between 18 months and 3 years. What supports regulation is consistent, calm adult responses — not punishment, which the child's brain is not yet equipped to process as intended.
My toddler isn't interested in other children. Is that a problem at 18 months?
Not necessarily. Genuine cooperative play — where children interact and share goals — does not typically emerge until closer to 3 years. Between 12 and 24 months, parallel play (playing near but not with other children) is the norm. However, a child who shows no interest in watching other children, does not respond to other children's bids for interaction, and does not look to an adult's face to share interesting events is showing a different pattern that may be worth discussing with your health visitor.
How much should a toddler understand versus how much they can say?
Comprehension consistently outpaces expression throughout early childhood. A child who says 10 words but clearly understands many more — following instructions, recognising named objects, responding to questions — is on a typical trajectory. A child whose understanding appears to lag alongside their expressive language, or who does not seem to understand simple instructions by 18 months, warrants a language and hearing assessment.
Key Takeaways
- Milestones are ranges, not deadlines — what matters is continued forward progress across all domains, not hitting each skill at an exact age.
- Key language milestones: first words by 12 months, 5–10 words by 15 months, 10–25 words by 18 months, 50+ words and two-word phrases by 24 months.
- Key motor milestones: walking by 15 months, running and stair-climbing with support by 18 months, jumping with both feet and confident running by 24 months.
- Social communication markers — pointing to share interest, social referencing, pretend play — are as diagnostically important as language word counts.
- The NHS 2-year developmental check is an important screening opportunity, but concerns should be raised whenever they arise, not held until the next scheduled appointment.
- Red flags that are never wait-and-see: not walking by 18 months, no words by 16 months, no two-word phrases by 24 months, no pretend play by 24 months, or any loss of previously acquired skills.
📋 SOURCES & FACT-CHECKING
This article is compiled and verified against these authoritative sources: - CDC (Centers for Disease Control & Prevention) - WHO (World Health Organization) - ACOG (American College of Obstetricians and Gynecologists) - NHS (National Health Service) - AAP (American Academy of Pediatrics)
Last verified: June 2026
Educational content only. Always consult your pediatrician for medical decisions.
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PregnancySprout Editorial Team
Our editorial team researches every article against primary medical sources — NHS, WHO, NICE, and RCOG guidelines. We are health writers and parents, not doctors; content is reviewed for accuracy but does not constitute medical advice.
✓ Fact-checked against NHS, WHO, and NICE guidelines
