Conception and Pregnancy
All human life begins from conception. Majority of the time, women won't know the exact day when they got pregnant. Your doctor will count the start of your pregnancy from the first day of your last menstrual period. That's about two weeks ahead of when conception actually occurs.
Each month inside your ovaries, a group of eggs starts to grow. Eventually one of the eggs erupts from the follicle and this is known as ovulation. It usually happens about two weeks before your next period. A hormone is released that helps thicken the lining of your uterus, getting it ready for the egg. After the egg is released, it moves into the fallopian tube. When a sperm does make its way into the Fallopian tube and burrow into the egg, it fertilises the egg. The egg changes so that no other sperm can get in. The egg stays in the Fallopian tube for about three to four days, but within 24 hours of being fertilised it starts dividing very fast into many cells. It keeps dividing as it moves slowly through the fallopian tube to the uterus. The developing collection of cells is now called an embryo and is attached to the wall of the uterus by a placenta. Chemicals are released to prevent the women having another menstrual period.
By 8 weeks, the embryo had grown between approximately 3 and 4cm, has a recognisable heartbeat and the beginnings of eyes, ears and a mouth. At this stage, it’s known as a foetus. During the remaining 7 months, all the organs continue to develop and by 20 weeks, the foetus will have reached about half its length at birth and by 32 weeks, it will be about half its birth weight.
Only about half fertilised eggs develop to become babies and is many eggs are lost without the women ever knowing she was pregnant.
Birth and Infancy: 0 – 3 years
Birth is the end point of pregnancy and results in the expulsion of newborn from the