This presentation summarizes human development from conception through birth. It is divided into three sections for the three trimesters of pregnancy. The first trimester discusses fertilization, embryo development through cleavage and gastrulation. Organ systems like the heart, brain and lungs begin to form. The second trimester outlines further physical development like skin, hair growth and the establishment of sleep cycles. The third trimester focuses on rapid weight gain, bone development and lung maturation. Fetal size and movements are tracked through each trimester. Key circulatory adaptations in the fetus are also outlined.