Apr 10, 2025 · Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images. At the start of this week, you ovulate. Your egg is …

At conception, the sperm joins with the ovum (egg) to form one cell that contains the complex genetic blueprint for every detail of human development. At this point the child’s sex, hair and …

Jul 26, 2023 · The first week of embryonic development is filled with an eclectic arrangement of physical and biochemical changes. Each step is a part of a cascade of events that must be …

Mar 18, 2025 · Within the blastocyst, the inner group of cells will become the embryo. The outer layer will give rise to part of the placenta. The placenta nourishes the unborn baby throughout …

Month 1 (weeks 1 through 4) Although it’s strange, the first two weeks of pregnancy are a “getting ready” period. Your body slowly releases more hormones and your uterus prepares for a …

This page is organised to show a week by week human timeline of development features and approximate timing of key events with more detailed information about specific events in …

Apr 11, 2025 · Key Events of Human Development during the first week following fertilization or clinical gestational age GA week 3, based upon the last menstrual period. The first week of …

Human embryonic development or human embryogenesis is the development and formation of the human embryo. It is characterised by the processes of cell division and cellular …

The fetus, until now called an embryo, is about 1 1 / 4 inches long, with the head making up about half this size. The beginnings of all key body parts are present, although they are not …

By the end of the first week, the embryo has traveled extensively, multiplied from 1 cell to several hundred, dramatically changed its shape and complexity, and begun the process of finding …