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Child and Adolescent Development Progression:

An Interactive Timeline and Guide

by Dr Philip Tam and Amanda J. Pooley

In this interactive, easy-to-use, visual timeline, the Child and Adolescent Research Institute has built an evidence and clinically based guide of the key developmental aspects, risks, and clinical issues for the first 18 years of life. A full reference list and further resources are provided at the end of the timeline.

 

These age groups have been chosen for clarity and ease of use (ie. as a multitude of age groups could cause confusion and an excess of information), and because they represent key, broad areas of social, intellectual and physical development.

It is recognised that there is no firm ‘cut off’ between each age group, and different children and family groups may present at different levels of ‘development’ according to personal or demographic factors. For example, some families may be less familiar with technology or vice-versa, some may have personal reasons for accessing technology less.

0–4 Years

Social and Personal Development

• ensure broadly normal milestones. • positive attachment experiences are vital for healthy development • promote fine motor skills via toys, writing, painting • ensure trust and empathy from primary caregivers

Sleep
Guidelines

• infants and toddlers need 11 to 14 hours sleep in a whole day • usually have two naps in daytime • this decreases to one afternoon nap from age 2

Family Guidelines and Modelling

• show good role modelling from infancy. • always prioritise child over ‘checking phone’. • shared family time. For example, meals and outings without any devices present.

Emerging Mental Health Disorders

• learning difficulties and language delay • early signs of autism possible • trauma and disrupted attachment • excess temper tantrums/infant anxiety • sleep and feeding disorders (may be related to anxiety or physical problem)

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Screen Use
Guidelines

• avoid or minimise all device usage, including television. • do not use devices as a ‘pacifier’ or to aid sleep/settling. • may, from age of two, use screens as tool to aid communication (For example, with relatives).

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5–9 Years

Social and Personal Development

• ensure broadly normal milestones • support independent activities of daily living. For example, dressing, toileting, fine motor skills • individual personality and characteristics will emerge. Encourage independent and social play/interactions • promote an ‘imaginative play space’ that is not screen/device based

Sleep
Guidelines

• need 10 to 12 hours sleep, device free for 1 to 2 hours • should sleep on own (in own bed) with a little settling needed prior to sleeping

Family Guidelines and Modelling

• continue to show good role modelling. • be attuned to child’s needs and their developing personality • continue to have daily screen free family time, and promote shared family activities • avoid being over controlling, except around safety and clear screen use limits

READ MORE

Emerging Mental Health Disorders

• learning difficulties and language delay • autistic and sensory behaviours may emerge more • selective mutism and anxiety • attention deficit and hyperactivity disorder (ADHD) • behaviour and oppositional problems • obsessive compulsive disorder (OCD)

READ MORE

Screen Use
Guidelines

• many have own device • clear rules on usage and limits • no devices in bedroom overnight • have 1 to 2 hours screen free time prior to sleeping • aim to have more time on non screen activities in the day than screen based activities

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10–14 Years

Social and Personal Development

• able to do all activities of daily living independently and without prompting • fine and gross motor skills developed • specific skills or interests may be emerging. For example, sporting, musical • personality and temperament style now more clear

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Sleep
Guidelines

• able to sleep through the night • should require minimal or a little amount of ‘settling’ prior to sleep • requires 9 to 11 hours total amount • no nap in the day • keep devices out of bedroom if possible

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Family Guidelines and Modelling

• continue to display positive role modelling • promote clear, regular structures through the day, including weekends • support individual interests, especially external/non screen activities • avoid anger, demeaning or criticising behaviours

Emerging Mental Health Disorders

• learning difficulties and language delay may become more prominent. • eating disorders may show early signs • depression and anxiety • ADHD may worsen if not treated • obsessive compulsive disorder (OCD) • behavioural and oppositional problems • very rarely, signs of bipolar or psychosis may emerge

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Screen Use
Guidelines

• most have their own devices, for personal and schooling use • maintain clear screen time guidelines and limits, both for gaming and social media • promote device usage in a common space and not bedroom • no devices in bedroom overnight • at least 1hr of screen free time prior to sleeping

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15–18 Years

Social and Personal Development

• fully or nearly independent in activities of daily living • more responsible for own belongings • personality nearly fully formed, although may still change • may have own part time job and finances • still needs positive role modelling from all caregivers

Sleep
Guidelines

• need 8 to 10 hours unbroken sleep • device free for 1 hour pre bedtime • should not feel tired in the day if getting adequate sleep • get specialist assistance if sleep problems persist

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Family Guidelines and Modelling

• continue to be a positive role model, including around device usage • still need a caregiver to provide support and a ‘safe haven’ • clear rules and expectations for the household, made in advance, will reduce future conflict and tensions • if tensions persist, consider engaging in Family Therapy or similar

Emerging Mental Health Disorders

• depression and anxiety • early signs bipolar disorder and psychosis • drug use and addictions • gender identity and dysphoria • eating disorders (mainly in females) • conduct disorders and aggressive behaviour (mainly in males) • ADHD may persist, or may begin to improve

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Screen Use
Guidelines

• almost all now have own devices, for education and personal usage • allow device usage in bedroom • can have devices overnight, if can show controlled use • 1hr of screen free time prior to sleeping is advised • online gambling also an emerging issue

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