There are three stages of fetal development: germinal, embryonic and fetal. Most people don’t talk about their pregnancy in these terms, but it can be helpful to know.

Human embryonic development covers the first eight weeks of development, which have 23 stages, called Carnegie stages. At the beginning of the ninth week, the embryo is termed a fetus (spelled …

Use the stage number links to images and information about each specific stage of human development over the first 8 weeks. The links below give a broad overview of developmental events during each …

May 12, 2025 · This diagram of human embryonic and fetal development offers a detailed look at the stages from fertilization to 20 weeks. It serves as a valuable tool for understanding prenatal growth, …

Apr 10, 2025 · Curious about how your baby is developing in the womb? Here's a breakdown of fetal development week by week.

The inner cells in the thickened area develop into the embryo, and the outer cells burrow into the wall of the uterus and develop into the placenta. The placenta produces several hormones that help …

How a human embryo develops into a fetus Learn about human embryonic and fetal development from fertilization to birth. The human body, like that of most animals, develops from a single cell produced …

It can be subdivided into distinct gestational periods. The first 2 weeks of prenatal development are referred to as the pre-embryonic stage. A developing human is referred to as an embryo during …

Key milestones include the first heartbeat at 6 weeks, brain development throughout pregnancy, and achieving viability around 24 weeks. Your maternal health, nutrition, and genetics all play crucial …

Jul 23, 2025 · During these weeks, the embryo undergoes rapid cell division, differentiation, and organization, establishing the foundational blueprint for the body. This period is marked by significant …