A–Z Glossary

Fetal period

The fetal period is the stage of pregnancy that begins around week 9, when growth and maturation become the main focus.

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Organ development timeline

Organ development timeline

What organ development means in early pregnancy Organ development begins during the embryonic period, when cells move from broad patterning into specialized tissue layers and then into recognizable structures. In standard embryology, organogenesis occurs from weeks 3 to 8 after conception, and this is the period in which the body’s major organ systems are established. […]