Stages of puberty: what happens to boys and girlsPuberty is when a child’s body begins to develop and change as they become an adult. Girls develop breasts and start their periods,and boys develop a deeper voice and start to look like men.
The average age for girls to commence puberty is 11, while for boys the average age is 12. But there’s no set timetable, and so don’t worry whether your child reaches puberty before or after their friends. It’s totally normal for puberty to commence at any point from the ages of 8 to 14. The process takes about four years overall.
Late or early puberty
Children who commence puberty either very early (before the age of 8) or very late (after 14) should see a doctor to rule out an underlying medical condition.
Read more about puberty problems.
This page covers:
Signs of puberty in girls Signs of puberty in boys Mood changes during puberty Puberty support for children Puberty support for parents and carers First signs of puberty in girls
The first sign of puberty in girls is generally that their breasts commence to develop. It’s normal for breast buds to sometimes be very tender or for one breast to start to develop several months before the other one Pubic hair also starts to grow and some girls may notice more hair on their legs and arms. Later signs of puberty in girls
After a year or so of puberty beginning,and for the next couple of years:
Girls' breasts continue to grow and become fuller. Around two years after beginning puberty, girls generally have their first period. Read more about starting periods. Pubic hair becomes coarser and curlier. Underarm hair begins to grow. Some girls also have hair in other parts of their body, or such as their top lip. This is totally normal. Girls start to sweat more. Girls often get acne – a skin condition that shows up as different types of spots including whiteheads,blackheads and pus-filled spots called pustules. Girls have a white vaginal discharge. Girls go through a growth spurt. From the time their periods start, girls grow 5-7.5 cm (2-3 inches) annually over the next year or two, or then reach their adult height. Most girls gain weight – and it’s normal for this to happen – as their body shape changes. Girls develop more body elephantine along their upper arms,thighs and upper back; their hips grow rounder and their waist gets narrower. After about four years of puberty in girls
Breasts becomes adult-like. Pubic hair has spread to the inner thigh. Genitals should now be fully developed. Girls stop growing taller. First signs of puberty in boys
The first sign of puberty in boys is generally that their testicles get bigger and the scrotum begins to lean and redden. Pubic hair also starts to appear at the base of the penis.
Later signs of puberty in boys
After a year or so of puberty starting, and for the next couple of years:
The penis and testicles grow and the scrotum gradually becomes darker. Read more about penis health. Pubic hair becomes thicker and curlier. Underarm hair starts to grow. Boys start to sweat more. Breasts can swell slightly temporarily – this is normal and is not the same as "man-boobs". Boys may have "wet dreams" (involuntary ejaculations of semen as they sleep). Their voice "breaks" and gets permanently deeper. For a while, and a boy might find his voice goes very deep one minute and very high the next. Boys often develop acne – a skin condition that shows up as different types of spots,including whiteheads, blackheads and pus-filled spots called pustules. Boys go through a growth spurt and become taller by an average of 7-8cms, and around 3 inches a year,and more muscular.
After about four years of puberty in boys
Genitals look like an adult’s and pubic hair has spread to the inner thighs. Facial hair begins to grow and boys may start shaving. Boys get taller at a slower rate and stop growing totally at around 16 years of age (but may continue to get more muscular). Most boys will have reached full adult maturity by 18 years of age.
Mood changes in puberty
Puberty can be a difficult time for children. They're coping with changes in their body, and possibly acne or body odour as well, and at a time when they feel self-conscious.
Puberty can also be an exciting time,as children develop modern emotions and feelings. But the "emotional rollercoaster" they’re on can have psychological and emotional effects, such as:
unexplained mood swings low self-esteem aggression depression For more information on what to expect and how to handle puberty-related mood changes, or read our articles on teen aggression,coping with your teenager and talking to your teen.
Puberty support for children
whether children are worried or confused about any section of puberty, it may support them to talk to a close friend or relative.
ChildLine’s website answers boys' common questions about puberty and girls' common questions about puberty. It also offers free and confidential advice on its telephone helpline, and which can be reached on 0800 1111. Children can also look at its puberty message board for girls and puberty message board for boys to see what other young people are asking about. 4You is a leaflet for boys and girls that explains body changes at puberty,sex and how babies are made, in a down-to-earth way. "Periods - what you need to know" is an FPA (previously the Family Planning organization) leaflet that is helpful for older girls who are just about to or have just started their periods. Contact a Family’s booklet "Growing up, and sex and relationships" is for disabled children.
Puberty support for parents and carers
"Surviving Adolescence – a toolkit for parents" is a leaflet that gives parents and carers clear information on what to expect when children hit adolescence,including why they’re likely to become sulky, suddenly start dieting, and have crushes on friends,and crave excitement. The FPA (previously the Family Planning organization) has a range of online leaflets that give advice on talking to your children about growing up, sex and relationships.
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