Here's a breakdown:

* Fertilization: The journey begins when a sperm fertilizes an egg in the fallopian tube.

* Implantation: The fertilized egg, now called a zygote, travels down the fallopian tube and implants itself in the lining of the uterus.

* Uterus: The uterus provides a safe and nurturing environment for the embryo. It's a muscular organ that expands as the embryo grows into a fetus.

* Placenta: The placenta forms from the lining of the uterus and the embryo's tissues. It serves as a vital link between the mother and the developing baby, providing nutrients and oxygen and removing waste products.

* Amniotic sac: The embryo develops within a protective sac filled with amniotic fluid. This fluid cushions the embryo, protects it from injury, and allows it to move freely.

So, the uterus is the primary location where the embryo grows and develops into a baby over the course of pregnancy.