From Puberty to Birth All about the circle of life

Everything grows: even trees!


Everyone is growing all the time. However, there is a stage in everyone life that occurs to everyone, where you will grow a lot at a very fast rate. This is called puberty. In girls, this generally happens from the age of 8-16, but it varies in everyone. For boys, it's 12-18.

Changes in Girls

  • Gets taller and wider
  • Grows pubic hair
  • Develops breasts
  • Face lengthens
  • Voice gets very slightly lower
  • Eggs mature inside her and gets period
  • Becomes aware of sexuality
  • Is more emotionally active

Changes in Boys

  • Voice gets much lower
  • Grows taller and broader, and gets larger muscles
  • Grows pubic and chest hair, and later, facial hair
  • Becomes aware of sexuality
  • Is more emotially active
  • Develops sperm
  • Penis grows in size

More about girls: Periods and the Menstrual Cycle

Periods happen to a girl between the age of 8 and 16 when her body is producing eggs so she can reproduce. A girl will bleed around 8 teaspoons of blood per month, for an average of 7 days. Changes in attitude and physical appearance happen during her period:

  • She has PMS, premenstrual syndrome, where her hormones make her feel angry, sad or sensitive.
  • Her skin becomes more oily.
  • She has painful cramps in her lower abdomen, and her breasts become sore and tender.
A period is an unused egg being released from the body

Periods happen when an eggs is released from the ovaries and travels down the Fallopian tube. It has not been fertilised, so it leaves the body through some blood that has been shed from the uterus.

A period happens for 7 days a month

The picture above is of the menstrual cycle. On average, a girl bleeds for 7 days a month. All the other days, her eggs are released and the lining thickens, and she is in the perfect state to reproduce. After a period, a new egg matures and her uterus lining thickens. This happens for around 6 days. Then, for two days an egg is released, ovulation. For the rest of the days, until the period, the egg travels to the uterus if it has not been fertilised and the lining gets even thicker.

Sexual Intercourse and Fertilisation

When two people are in love, they reproduce. This involves sexual intercoure, sex for short. This is when a woman's egg and a man's sperm fuse together inside the woman to create life. This happens when a mans penis enters the vagina. The man releases a sperm, which makes a difficult journey to reach the egg inside the woman.

A sperm cell

Thousands of sperm are released from the testis. Hundreds make their way through the woman's uterus, but as the woman's body sees them as foreign invaders, it tries to kill them. Only a few reach where the egg is, and the first sperm that gets there fertilises the egg. The rest die in the acidic insides of a woman's uterus.

Birth And Baby Growth

The fertilised egg inside the woman grows over 9 months. It starts out very small; after 4 weeks, the foetus is the size of a poopy seed, and after 12, it resembles a grape. After 20 weeks, the baby looks like the baby we would recognise after birth. This is called the Fetal Growth Period. At 32 weeks, the baby opens it's eyes.

Fetal Growth

At 24 weeks, the baby has turned head down in the womb.


When the woman's body is ready, she will give birth. The baby will be pushed out of the womb and the vagina, head first, so as not to cause long term damage. The woman is now a mother!

Thank You For Reading!

Here are some videos you could watch for further information:

By Hope CF, 7A


Created with images by skyseeker - "Sunflower" • the_nautilus - "leaves tree season" • Pezibear - "child girl blond" • Profile - "kid tie boy" • quapan - "Spermatozoon (disc shaped head 5.1 µm by 3.1 µm and a tail 50 µm long)" • Brett Holt - "Minutes after birth" • ndungusly - "newborn baby grayscale" • Virginia L. - "thank you"

Made with Adobe Slate

Make your words and images move.

Get Slate

Report Abuse

If you feel that this video content violates the Adobe Terms of Use, you may report this content by filling out this quick form.

To report a Copyright Violation, please follow Section 17 in the Terms of Use.