Here's a breakdown of the key stages:

* Fertilization: The union of a sperm and egg cell to form a single-celled zygote.

* Cleavage: Rapid cell division of the zygote, resulting in a ball of cells called a morula.

* Blastulation: Formation of a hollow ball of cells called a blastocyst.

* Gastrulation: The blastocyst folds inward, forming the three primary germ layers: ectoderm, mesoderm, and endoderm. These layers give rise to all the tissues and organs of the body.

* Organogenesis: The process of organ development from the three germ layers.

This is a simplified overview. Embryogenesis is a complex and fascinating process involving many genes and signaling pathways.