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