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22 Jan 2026
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Understanding the 7 Stages of Human Development and PIES in Life Stages for KS2
Leia 🫧
@aleyahafsa
Adolescence to Early Adulthood: Transition and Growth
Adolescence and early adulthood are transformative periods in the stages of human development from birth to death, marked by significant physical, intellectual, emotional, and social changes.
Adolescence begins with the onset of puberty, typically around age 11 for girls and 12 for boys. This stage brings about primary and secondary sexual characteristics and a significant growth spurt.
Definition: Puberty - The period during which adolescents reach sexual maturity and become capable of reproduction.
Intellectually, adolescents develop complex and abstract thinking skills. They continue to develop empathy and a stronger sense of right and wrong. This period is often characterized by academic challenges and the exploration of personal interests and future career paths.
Emotionally, adolescence is a time of increasing independence and self-discovery. Self-image and self-esteem become more prominent concerns, and mood swings are common. Social relationships take on new importance, with peer influence and pressure playing significant roles.
Highlight: The emotional and social changes during adolescence can significantly impact an individual's mental health and well-being.
Early adulthood marks the transition to full physical maturity. Individuals typically reach their full height and peak physical fitness during this stage. For women, this is often the period of highest fertility.
Intellectually, early adults continue to develop their thinking skills, often pursuing higher education or vocational training. This stage is crucial for career development and learning from life experiences.
Example: Many individuals in early adulthood balance work, continued education, and starting families, requiring advanced time management and decision-making skills.
Emotionally, early adulthood is a time for forming deep, lasting relationships. Individuals generally gain more control over their lives and feel more secure and content. However, new responsibilities like work and financial management can also lead to stress.
Socially, early adults often have active social lives, balancing friendships with romantic relationships and, for some, starting families. This stage often involves significant life events such as marriage and forming strong bonds with children.
Quote: "Early adulthood is a time of possibility, when individuals shape their identities and set the course for their future lives."
Understanding the physical, social and cognitive development at all stages during adolescence and early adulthood is crucial for supporting individuals through these transformative years and setting the foundation for a healthy and fulfilling adult life.
Infancy and Early Childhood: Laying the Foundation
The first two stages of human development, infancy and early childhood, are crucial periods of rapid growth and learning. These stages set the foundation for future development across all PIES areas.
In infancy, physical development is characterized by rapid weight gain and growth. Babies develop fine and gross motor skills, learning to grasp objects and eventually crawl and walk. Intellectually, infants learn through their senses and observation, with rapid development of language and thinking skills.
Highlight: The formation of secure attachments during infancy is critical for emotional development and future relationships.
Emotionally, infants are entirely dependent on their caregivers and form strong connections with familiar faces. Socially, their first relationships are typically with family members and caregivers.
Early childhood builds on these foundations. Physically, children continue to grow rapidly and improve their motor skills, becoming more independent in tasks like dressing and washing themselves.
Example: By early childhood, most children can tie their shoelaces and use utensils effectively, demonstrating improved fine motor skills.
Intellectually, early childhood is marked by curiosity and the development of reading and writing skills. Children's memory and recall abilities improve significantly during this stage.
Vocabulary: Parallel play - A stage in social development where children play alongside each other but not necessarily with each other.
Emotionally, children in early childhood begin to develop their own personalities and experience a wider range of feelings. They learn to express these emotions and form friendships, which help them feel more secure in new environments like school.
Socially, language development allows for easier interactions with peers. Children engage in parallel play and begin to learn acceptable social behaviors through organized games and activities.
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Most popular content: Child Growth and Development
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4.9/5
App Store
4.8/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Understanding the 7 Stages of Human Development and PIES in Life Stages for KS2
Leia 🫧
@aleyahafsa
The 7 stages of human development encompass the entire lifespan, from infancy to late adulthood. This comprehensive guide explores the physical, intellectual, emotional, and social (PIES) aspects of growth across each life stage, providing insights into the stages of human... Show more
Adolescence to Early Adulthood: Transition and Growth
Adolescence and early adulthood are transformative periods in the stages of human development from birth to death, marked by significant physical, intellectual, emotional, and social changes.
Adolescence begins with the onset of puberty, typically around age 11 for girls and 12 for boys. This stage brings about primary and secondary sexual characteristics and a significant growth spurt.
Definition: Puberty - The period during which adolescents reach sexual maturity and become capable of reproduction.
Intellectually, adolescents develop complex and abstract thinking skills. They continue to develop empathy and a stronger sense of right and wrong. This period is often characterized by academic challenges and the exploration of personal interests and future career paths.
Emotionally, adolescence is a time of increasing independence and self-discovery. Self-image and self-esteem become more prominent concerns, and mood swings are common. Social relationships take on new importance, with peer influence and pressure playing significant roles.
Highlight: The emotional and social changes during adolescence can significantly impact an individual's mental health and well-being.
Early adulthood marks the transition to full physical maturity. Individuals typically reach their full height and peak physical fitness during this stage. For women, this is often the period of highest fertility.
Intellectually, early adults continue to develop their thinking skills, often pursuing higher education or vocational training. This stage is crucial for career development and learning from life experiences.
Example: Many individuals in early adulthood balance work, continued education, and starting families, requiring advanced time management and decision-making skills.
Emotionally, early adulthood is a time for forming deep, lasting relationships. Individuals generally gain more control over their lives and feel more secure and content. However, new responsibilities like work and financial management can also lead to stress.
Socially, early adults often have active social lives, balancing friendships with romantic relationships and, for some, starting families. This stage often involves significant life events such as marriage and forming strong bonds with children.
Quote: "Early adulthood is a time of possibility, when individuals shape their identities and set the course for their future lives."
Understanding the physical, social and cognitive development at all stages during adolescence and early adulthood is crucial for supporting individuals through these transformative years and setting the foundation for a healthy and fulfilling adult life.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Infancy and Early Childhood: Laying the Foundation
The first two stages of human development, infancy and early childhood, are crucial periods of rapid growth and learning. These stages set the foundation for future development across all PIES areas.
In infancy, physical development is characterized by rapid weight gain and growth. Babies develop fine and gross motor skills, learning to grasp objects and eventually crawl and walk. Intellectually, infants learn through their senses and observation, with rapid development of language and thinking skills.
Highlight: The formation of secure attachments during infancy is critical for emotional development and future relationships.
Emotionally, infants are entirely dependent on their caregivers and form strong connections with familiar faces. Socially, their first relationships are typically with family members and caregivers.
Early childhood builds on these foundations. Physically, children continue to grow rapidly and improve their motor skills, becoming more independent in tasks like dressing and washing themselves.
Example: By early childhood, most children can tie their shoelaces and use utensils effectively, demonstrating improved fine motor skills.
Intellectually, early childhood is marked by curiosity and the development of reading and writing skills. Children's memory and recall abilities improve significantly during this stage.
Vocabulary: Parallel play - A stage in social development where children play alongside each other but not necessarily with each other.
Emotionally, children in early childhood begin to develop their own personalities and experience a wider range of feelings. They learn to express these emotions and form friendships, which help them feel more secure in new environments like school.
Socially, language development allows for easier interactions with peers. Children engage in parallel play and begin to learn acceptable social behaviors through organized games and activities.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Most popular content: Child Growth and Development
Most popular content in Health & Social Care
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.9/5
App Store
4.8/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user