opponent(Noun) An individual or group who is a rival of another. opponent(Noun) One who attempts to stop the progression of. opponent(Noun) One who objects to. opponent(Noun) In team sports, a player of an opposite team.
First Trimester (0 to 13 Weeks) The first trimester is the most crucial to your baby's development. During this period, your baby's body structure and organ systems develop. Most miscarriages and birth defects occur during this period. Your body also undergoes major changes during the first trimester. These changes often cause a variety of symptoms, including nausea, fatigue, breast tenderness and frequent urination. Although these are common pregnancy symptoms, every woman has a different experience.
First trimester (week 1-week 12) At four to five weeks: Your baby's brain and spinal cord have begun to form. The heart begins to form. Arm and leg buds appear. Your baby is now an embryo and one-twenty-fifth inch long.