By the end of the 12th week of pregnancy, or 10 weeks after conception, your baby might weigh about 1/2 ounce (14 grams).
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Make a gift to honor and celebrate the contributions of our world-class doctors.