NEW: Scientific Sponsor - Sociedade Portuguesa de Medicina Materno-Fetal (SPOMMF) www.spoomf.pt Calculate gestational age quickly and intuitively using a tool developed by doctors for doctors. The development of this mobile app was based on multiple information available from the American College of Obstetricians and Gynecologists (ACOG)(1), the U.S. Department of Health & Human Services(2) and U.S. National Library of Medicine(3). Therefore, the information displayed on the mobile app is not intended to replace a medical appointment nor should it be construed as a definitive medical diagnosis or consensual guideline. Bibliography: (1) https://www.acog.org/Patients/FAQs/Routine-Tests-During-Pregnancy?IsMobileSet=false#why (2) https://www.womenshealth.gov/pregnancy/youre-pregnant-now-what/prenatal-care-and-tests (3) https://medlineplus.gov/prenatalcare.html