The concepts, mechanism and effects of oogenesis, spermatogenesis, and fertilization are explained. The calculation of gestation period, phases in gestation period, determination of sex of fetus, fetal development by age, stages of embryonic development week wise and monthly wise are explained, necessary diagrams are given. In antenatal period—the Conception and its’ mechanism, calculation of EDD, physiological changes in all systems are described. Signs and symptoms of pregnancy in first, second and third trimesters are narrated. Diagnosis of pregnancy—pregnancy tests, midwifery history, abdominal examination; components of health care services during first visit and subsequent visits, high risk approach, antenatal advice/antenatal care has explained in detail.