What stage marks the period from implantation until 8 weeks gestation?

The embryonic stage is characterized by the period from implantation until approximately 8 weeks of gestation. During this crucial phase, the foundation for all major organ systems is established, and it is a time of significant development that occurs rapidly. Key processes such as organogenesis take place, and by the end of this stage, the embryo will have developed many distinct structures, including the heart, brain, and limbs.

In contrast, the gestational stage generally refers to the entire duration of pregnancy, lasting from the first day of the last menstrual period until labor begins. The fetal stage follows the embryonic stage, lasting from approximately 8 weeks until birth, primarily focusing on the growth and maturation of the established organs. The neonatal stage pertains to the time period immediately following birth. Understanding these stages is critical for recognizing the timelines and key developments that occur throughout pregnancy.