Pregnancy occurs when a sperm cell fertilizes an egg cell. This can happen when a man ejaculates semen into a woman's vagina during intercourse. The semen contains millions of sperm cells, and only one is needed to fertilize an egg.
The egg cell is released from one of the woman's ovaries during ovulation. Ovulation usually occurs about 14 days before the start of a woman's menstrual period. If a sperm cell fertilizes the egg, the fertilized egg will travel down the fallopian tube and implant in the lining of the uterus.
The fertilized egg will then start to grow and develop into a baby. The baby will receive nutrients and oxygen from the mother's blood through the placenta. The placenta is an organ that develops in the uterus during pregnancy.
The baby will also develop waste products, such as carbon dioxide, which will be removed from the mother's blood through the placenta. The baby will also receive antibodies from the mother, which will help to protect the baby from infection.
The baby will continue to grow and develop in the uterus for about 40 weeks. At the end of pregnancy, the baby will be ready to be born. The baby will be delivered through the vagina, or in some cases, through a cesarean section.
How is a Baby Formed?
A baby is formed when a sperm cell fertilizes an egg cell. The fertilized egg is called a zygote. The zygote will then divide and grow into an embryo. The embryo will eventually develop into a fetus.
The fetus will grow and develop in the mother's uterus for about 40 weeks. During this time, the fetus will develop all of the organs and body systems that it needs to survive outside of the womb.
At the end of pregnancy, the baby will be ready to be born. The baby will be delivered through the vagina, or in some cases, through a cesarean section.