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Pregnancy Trimesters Explained: Complete Week-by-Week Guide, Symptoms & Baby Development Introduction Pregnancy is a complex biological process involving hormonal, physical, and emotional changes that support fetal development. It is divided into three stages known as trimesters, each with unique milestones for both mother and baby. According to World Health Organization (WHO) and American College of Obstetricians and Gynecologists (ACOG) , understanding trimester-based development helps reduce pregnancy risks and improves maternal health outcomes. Trimesters What Are Pregnancy Trimesters? A full-term pregnancy lasts approximately 40 weeks, calculated from the first day of your last menstrual period (LMP). These weeks are divided into three trimesters: First Trimester: Week 1–12 Second Trimester: Week 13–26 Third Trimester: Week 27–40 Medical references such as Williams Obstetrics highlight that this structure allows healthcare providers to monitor feta...