Index finger pointing at 15-18 months — what "where's the ball?" really tells you

You ask, "Where's the ball?" And your toddler's index finger shoots out, aimed precisely at the toy across the room.

It feels like a small party trick. It isn't. Research shows that index-finger pointing — specifically, in response to a question like this — is one of the most closely studied gestures in early childhood, with direct links to language development and, in more significant cases, early identification of developmental differences.

Here's what the science says about this exact moment.

Index-finger pointing should already be established by 15-18 months

A large longitudinal study by Rüther and colleagues (2024, Journal of Child Language) found that canonical index-finger pointing typically emerges between 9 and 15 months across cultures, with a median age of onset around 11 months. The study found that pointing frequency and stability increase steadily from 10 to 12 months onward, closely tied to related skills like point-following and broader joint attention.

Separate research by Liszkowski and colleagues placed the age of emergence at 8 to 15 months, finding that infants who use index-finger pointing specifically — rather than whole-hand pointing — show higher pointing frequency, more vocal accompaniment, and stronger comprehension of pointing to objects that are out of sight.

Not all pointing is the same — and the difference matters

Here's something most parents don't realise: the shape of the point carries meaning.

A detailed study by Cochet & Vauclair (2010, Infant Behavior & Development) analysed pointing gestures in toddlers aged 15 to 30 months and found that roughly 60% of points were made with the index finger, and 40% with the whole hand. Critically, declarative and expressive points — the kind used to share information or answer a question — were disproportionately index-finger and accompanied by more vocalisation. Imperative points, used to request something, were more often made with the whole hand.

Your toddler's point is doing more cognitive work than it looks

Paulus (2023) tracked the use of the index finger across infancy and toddlerhood and found a clear developmental shift: by the second year of life, a large share of index-finger extensions are clearly communicative and tightly embedded within joint-attention frames — meaning your toddler isn't just gesturing, they're actively coordinating attention with you around a shared reference point.

This lines up directly with earlier research by Behne and colleagues (2012, British Journal of Developmental Psychology), who used a hidden-toy task where an adult asked "Where is it? Where is the [X]?" while pointing to the hiding location. Even at 12 months, infants searched correctly based on the pointing cue in roughly 74% of trials. Many infants also "reversed roles" — producing their own points to show the adult where the toy was, demonstrating that both understanding and producing pointing gestures are present remarkably early.

Pointing predicts language development

One of the most compelling findings for parents comes from Salo and colleagues (2018), who found that gesture use and responding to joint attention at 12 months load onto a shared underlying construct, but each uniquely predicts later language outcomes. Specifically, the quality of joint-attention interactions at 15 months was found to predict expressive language at 21 months.

Index-finger pointing sits directly within this gesture and joint-attention constellation — and it develops hand-in-hand with early speech sounds like canonical babbling. How well your toddler points and responds to pointing around 15 to 18 months isn't an isolated motor skill. It's a genuine early signal of where their language development is headed.

By 18 months, pointing becomes a tool for seeking information

A study published in the Journal of Experimental Child Psychology (2019) found that 18-month-olds use pointing in a specifically information-seeking way. When shown out-of-reach novel objects, infants pointed selectively to obtain labels from an adult — and persisted longer in pointing when they didn't receive a label in response. Notably, when infants expressed interest by reaching instead of pointing, they didn't show the same learning benefit.

Why "where is the ball?" is also a clinically significant question

Index-finger pointing carries real clinical weight. The original CHAT screening study, conducted across a UK population of 16,000 children, found that the failure of protodeclarative pointing — combined with reduced gaze-monitoring and pretend play — at 18 months carried an approximately 83% risk of autism within that cohort.

Building on this, the Chinese CHAT-23 adaptation specifically includes items asking whether a child uses their index finger to point to indicate interest, treating this as a key discriminating item between 18 and 24 months. A 2025 study published in the Journal of Autism and Developmental Disorders, examining younger siblings of autistic children, similarly found that "follows a point," "protoimperative pointing," and "protodeclarative pointing" were among the strongest discriminating items at 12, 18, and 30 months.

Separately, research comparing typically developing toddlers with those showing language delay found that infants with language delay produced index-finger points approximately 2 months later than their typically developing peers, across imperative, declarative, and informative pointing types.

What healthy pointing looks like at 15-18 months

Based directly on the research, here's what to watch for:

• Index-finger, not whole-hand — by this age, most declarative pointing (answering questions, sharing information) should be precise, index-finger pointing rather than an open-hand gesture.
• Accurate response to "Where is X?" — when asked where a familiar object is, your toddler should reliably and correctly point toward it.
• Vocalisation alongside the point — research shows declarative index-finger points are typically accompanied by vocal sounds, not silent gesturing alone.
• Reciprocal pointing — watch for your toddler pointing things out to you unprompted, actively initiating shared attention rather than only responding.
• Persistence when seeking information — if your toddler points at something unfamiliar and doesn't get a response, healthy development at this age often includes continued or repeated pointing until they get an answer.

When to talk to your paediatrician

Clinical milestone guidance from Johns Hopkins notes that by 18 months, children typically understand simple one-step questions like "Where is the ball?" If by 18 months your toddler shows no index-finger pointing at all, doesn't respond to "Where is X?" questions, or shows an absence of pointing alongside reduced eye contact or limited interest in shared play, this combination is worth raising with your paediatrician directly and early.

For more on how early gestures and shared attention connect, see our pieces on hide-and-seek and pointing and the arms-up "pick me up" milestone.

How Hidden Hum helps parents track this milestone

Pointing is one of the most researched, most predictive gestures in early childhood — yet most parents have no structured way to observe or record it consistently. The Hidden Hum early skills profiler, our RBSK-aligned tool, closes that gap.

At the 15 and 18-month stages, Hidden Hum prompts parents to observe and record exactly what the research identifies as significant — whether pointing is index-finger or whole-hand, whether it's accompanied by vocalisation, and whether your toddler responds accurately to simple "Where is X?" questions.

Frequently asked questions

When should a toddler start pointing with their index finger?

Research shows canonical index-finger pointing typically emerges between 9 and 15 months, with a median age of onset around 11 months. By 15 to 18 months, most toddlers use it consistently as their default form of pointing.

Why does it matter if my toddler uses their index finger versus their whole hand to point?

Research found that in toddlers aged 15 to 30 months, about 60% of points were index-finger. Declarative points made to share information or answer a question were disproportionately index-finger and more vocal, making it a stronger indicator of communicative competence.

Should my toddler be able to point to an object when I ask "Where is the ball?"

Yes. Clinical milestone guidance indicates that by 18 months, children typically understand simple one-step questions like this and respond with pointing. Research found even 12-month-olds could search correctly based on pointing cues in over 70% of trials.

Is a delay in pointing linked to autism or language delay?

Research shows infants with language delay produce index-finger pointing approximately 2 months later than typically developing peers. Large-scale autism screening research has identified absent protodeclarative pointing at 18 months as one of the most specific early risk indicators.

Sources: Rüther et al. (2024), Journal of Child Language; Frontiers in Psychology (2022); Paulus (2023); Cochet & Vauclair (2010), Infant Behavior & Development; Liszkowski et al.; Behne et al. (2012), British Journal of Developmental Psychology; Salo et al. (2018); Journal of Experimental Child Psychology (2019); Baron-Cohen et al. (CHAT); CHAT-23 (Chinese adaptation); JADD (2025).

Hidden Hum is part of the Fairy Tales Wellbeing family — a non-diagnostic, RBSK-aligned early skills profiler helping parents track developmental milestones from birth to 6 years.