The document discusses pregnancy and pre-natal care. It defines pregnancy as beginning with fertilization and lasting until birth, either 9 months or 38-40 weeks. During this time, the developing human is called an embryo for the first 8 weeks and then a fetus. The document outlines some common physical changes experienced by the mother, such as morning sickness caused by hormones and breast enlargement to prepare for nursing. Over the 9 months, the woman's uterus stretches significantly to hold the growing fetus, causing abdominal growth and other symptoms like leg swelling and sleep issues. Finally, it lists several normal physical conditions and symptoms commonly experienced during pregnancy.