Understanding Your Pregnancy Timeline
A full-term pregnancy lasts about 40 weeks from the first day of your last menstrual period (LMP). These 40 weeks are divided into three trimesters, each with its own milestones and challenges. Our week-by-week guide covers 28 key weeks, giving you detailed information about your baby's development, the symptoms you may experience, and practical tips for each stage.
The Three Trimesters
The first trimester (weeks 1-13) is when the foundation is laid. Your baby develops from a single cell into a recognizable human form with all major organs beginning to function. This is also when many women experience morning sickness, fatigue, and breast tenderness.
The second trimester (weeks 14-26) is often called the "golden period" of pregnancy. Many early symptoms ease, energy returns, and you begin feeling your baby move. Your baby grows rapidly, developing hearing, vision, and distinct features.
The third trimester (weeks 27-40) is the home stretch. Your baby gains most of its weight, the lungs mature for breathing, and the body prepares for delivery. You may experience increased discomfort, Braxton Hicks contractions, and the nesting instinct.
Baby Size Comparisons by Week
One of the most popular ways to track baby growth is through fruit and vegetable comparisons. Starting as a tiny poppy seed at week 4, your baby grows to the size of a lime by week 12, a banana by week 20, an eggplant by week 28, and a full watermelon by week 40. These comparisons help visualize the incredible growth that happens over 40 weeks.
When to Call Your Doctor
While many pregnancy symptoms are normal, some require immediate medical attention. Contact your healthcare provider if you experience heavy bleeding, severe abdominal pain, sudden swelling of the face or hands, persistent headaches with vision changes, decreased fetal movement, or fluid leaking from the vagina before 37 weeks. Regular prenatal visits are essential for monitoring both your health and your baby's development.