The journey from embryo to baby is a fascinating and intricate process that involves several stages of development. Here's an overview of the key stages:

The process begins when a sperm cell fertilizes an egg cell, typically occurring in the fallopian tubes. This forms a single cell called a zygote.

Cleavage: The zygote undergoes rapid cell division called cleavage, forming a cluster of cells known as a morula.

Blastocyst Formation: As cleavage continues, the morula develops into a blastocyst, consisting of an inner cell mass (which will become the embryo) and an outer layer of cells (which will form the placenta).

Implantation: The blastocyst moves through the fallopian tube into the uterus and implants itself into the uterine lining. This typically occurs around 6-10 days after fertilization.

Gastrulation: After implantation, the inner cell mass undergoes gastrulation, a process where it transforms into three primary germ layers: ectoderm, mesoderm, and endoderm. These layers will give rise to different tissues and organs in the body.

Organogenesis: Organogenesis is the process of organ formation, during which the three germ layers differentiate and develop into specific organs and structures. This stage is critical for the development of major systems such as the nervous system, cardiovascular system, and digestive system.

Fetal Development: By the end of the embryonic period (around 8 weeks after fertilization), the developing organism is considered a fetus. During the fetal period, which lasts until birth, the focus is on growth and refinement of existing structures rather than the formation of new organs.

Birth: The final stage of development is birth, where the baby is delivered from the mother's uterus through the birth canal or via cesarean section.

Throughout this journey, the developing embryo and fetus are vulnerable to various factors that can influence their growth and development, including genetic factors, maternal health, environmental exposures, and prenatal care.