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Developmentally typical or problematic and harmful?

Sexual behaviour is a developmentally expected part of growing up. Knowing what is developmentally typical for a child's age and capacity can help guide your response and take appropriate action.

How can I tell when I need to be worried?

Sexual behaviour is one of the ways children and young people learn about their bodies, feelings and relationships. Many sexual behaviours are an expected part of development and reflect curiosity, learning and exploration.

What can be difficult is knowing when a behaviour is developmentally typical and when it may indicate a need for additional support. The same behaviour can have different meanings depending on a child's age, developmental stage, experiences, relationships and circumstances.

Understanding behaviour within these contexts is important. Recognising problematic and harmful behaviours early can support timely assessment, guidance and support.

How this collection helps

These resources will help you spot the signs of unsafe behaviours. You'll find information on sexual development at different ages and when to seek extra support.

The continuum of sexual development

Understand the range of sexual behaviours from developmentally expected and age-appropriate through to problematic and harmful behaviours.

Browse resources by topic

What are harmful sexual behaviours and why do they develop? For carers

A resource for carers explaining what harmful sexual behaviour is, how it differs from developmentally expected sexual behaviour and individual, family and community factors that can be associated.

Australian Centre for Child Protection

Early years

Understanding sexual development and behaviours in young children.

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Childhood sexual behaviour at 4-6 years: Parent education guide

A short guide to share with parents and carers about sexual development at 4-6 years, including what is developmentally expected and when additional support may be needed.

Raising Children Network • 2026
Childhood sexual behaviour at 0-3 years: parent education guide

A short guide to share with parents and carers about sexual development at 0-3 years, including what is developmentally expected and when additional support may be needed.

Raising Children Network • 2026
Sexual development and sexual behaviour: children with disability 0-6 years

A guide to help professionals support parents and carers to understand sexual development in children with disability aged 0–6, including how disability may shape experiences and support needs.

Raising Children Network • 2025

Primary

Recognising developmentally typical and problematic and harmful sexual behaviours during the primary school years.

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Childhood sexual behaviour at 10-11 years: parent education guide

A short guide to share with parents and carers about sexual development at 10-11 years, including what is developmentally expected and when additional support may be needed.

Raising Children Network • 2026
Childhood sexual behaviour at 7-9 years: parent education guide

A short guide to share with parents and carers about sexual development at 7-9 years, including what is developmentally expected and when additional support may be needed.

Raising Children Network • 2026
Childhood sexual behaviour at 4-6 years: Parent education guide

A short guide to share with parents and carers about sexual development at 4-6 years, including what is developmentally expected and when additional support may be needed.

Raising Children Network • 2026

Teen

Understanding sexual development, relationships and behaviours in adolescence.

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Adolescent sexual behaviour at 15-17 years: parent education guide

A short guide to share with parents and carers about sexual development at 15-17 years, including what is developmentally expected and when additional support may be needed.

Raising Children Network • 2026
Adolescent sexual behaviour at 12-14 years: parent education guide

A short guide to share with parents and carers about sexual development at 12-14 years, including what is developmentally expected and when additional support may be needed.

Raising Children Network • 2026
Sexual development and sexual behaviour: teenagers with disability 15-17 years

A guide to help professionals support parents and carers to understand sexual development in teens with disability aged 15-17, including how disability may shape experiences and support needs.

Raising Children Network • 2025
When to think about getting help

Webpage to share with parents and carers of children and young people with intellectual disability and autism, outlining sexual behaviours that might cause concern and advice on seeking help.

Planet Puberty

Not a practitioner?

Parents and carers

If you’re a parent or carer seeking information or worrying about a behaviour, you're not alone. Find resources to help you understand child sexual development, support safety, and respond to concerns about sexual behaviour.

Children and young people

It’s normal to have questions about your body, feelings, sex and relationships. If you’re a young person looking for information – head here. We’ve got information just for you.