This document provides a week-by-week overview of fetal development from conception through 40 weeks of pregnancy. It includes pictures and descriptions of how the embryo and fetus changes in appearance and develops different features over time, such as facial features forming in week 8 and the development of fingers and toes in week 7. The summaries highlight physical milestones like the fetus growing to be the size of a pea in week 6 and the ability to detect the baby's gender on ultrasound by week 20.