A university explainer about the back-and-forth between a young child and a caring adult: notice a look, sound or gesture, respond, and leave room for the child to respond again.
Toddlers, 1–3 years
Toddlers move from single words to short conversations, start to notice other people's feelings, and love to explore and pretend.CDC · Milestones by 3 years ↗
What your child is developing
These are things most children can do by this age. They are for understanding your child, not a scorecard; every child develops at their own pace.CDC · Positive parenting tips: infants (0–1) ↗
Social and emotional
- By 2, notices when others are hurt or upset, and looks at your face to see how to react in a new situation.CDC · Milestones by 2 years ↗
- By 3, calms down within 10 minutes after you leave, and joins other children to play.CDC · Milestones by 3 years ↗
Language
- By 2, says at least two words together, like "More milk".CDC · Milestones by 2 years ↗
- By 3, talks with you in at least two back-and-forth exchanges and asks who, what, where and why questions.CDC · Milestones by 3 years ↗
Thinking and learning
- By 2, tries switches, knobs and buttons, and plays with more than one toy at a time, like toy food on a toy plate.CDC · Milestones by 2 years ↗
- By 3, avoids touching hot objects when you warn them.CDC · Milestones by 3 years ↗
Movement
- By 2, runs and kicks a ball.CDC · Milestones by 2 years ↗
- By 3, uses a fork and puts on some clothes by themselves.CDC · Milestones by 3 years ↗
The research behind it
Start with the finding, then check the study type, source and limits. We select research by topic; a programme’s overall effect does not establish the effect of each activity.Following about 2,400 children, more screen time at 2 and 3 years was linked to poorer developmental screening results a year or more later.
A meta-analysis of 42 studies. More screen use was linked to weaker language skills, while co-viewing with an adult and better-quality programmes were linked to stronger skills.
For children aged 1 to 8, play with gentle adult guidance did better than direct teaching on early maths, shapes and switching between tasks, and better than free play on spatial words. Other outcomes showed no difference.
Across 102 randomised trials in 33 countries, parenting programmes in the first three years improved several child-development and caregiving outcomes. Results varied, and parental depressive symptoms did not improve significantly overall.
Meta-analysisJeong J, Franchett EE, Ramos de Oliveira CV, Rehmani K, Yousafzai AK, 2021Study detailsA classic meta-analysis found that preventive interventions could improve caregiver sensitivity and infant attachment security. It supports studying concrete care behaviours, not labelling a family from a short online test.
A review of 49 studies covering 50 interventions and 23,098 participants aged 2–17 found that several approaches can support self-regulation. Programmes and outcome measures differed substantially.
9-month-old infants learned Mandarin speech sounds from live sessions with a person, but not from the same material shown on video or audio.
Idea roots
Educators whose ideas connect to this stage. Open one to see what modern research supports and what it does not.What you can do together
- Set up a special time to read books together.CDC · Positive parenting tips: toddlers (2–3) ↗
- Encourage pretend play.CDC · Positive parenting tips: toddlers (2–3) ↗
- Go for walks to explore things around you, and teach simple songs and rhymes.CDC · Positive parenting tips: toddlers (2–3) ↗
- Give active physical challenges and let them try again when a first attempt fails.Harvard Center on the Developing Child · Activities for 18–36 months ↗
- If you speak more than one language fluently, use them with your child.Harvard Center on the Developing Child · Activities for 18–36 months ↗
Selected resources for this stage
Start with one resource that fits your needs. Classic readings are for caregivers to reflect on, not a required reading list for children.
An age-grouped collection of games and activities for practising working memory, inhibitory control and flexible thinking, with adults gradually adjusting their help.
WHO guidance brings together responsive caregiving, early learning, nutrition services and support for maternal mental health during the first three years of life.
Free activity tips that fit into meals, getting dressed, travel and other shared moments, with brief explanations of the ideas behind them.
Free tools for this age
How we choose toolsHealth and safety essentials
- Guidelines on physical activity, sedentary behaviour and sleep for children under 5 years of age · World Health Organization
- Media and Young Minds (AAP policy statement) · AAP Council on Communications and Media
- CDC's Developmental Milestones (Learn the Signs. Act Early.) · US Centers for Disease Control and Prevention
- Vaccines and immunization ↗ · World Health Organization
- Safety and prevention ↗ · American Academy of Pediatrics
Further reading
Classic parenting books with a note on the evidence. Links go to publisher details and library holdings (WorldCat). No affiliate links.Evidence: Uses brain science to explain children's behaviour; the 12 strategies come from the authors' clinical experience rather than trials. Evidence level: expert opinion.
Evidence: Three developmental scientists summarise infant research up to 1999 for parents. Newer studies have added detail since.