Pregnancy is an exciting journey divided into three trimesters, each marked by unique milestones and changes. Understanding what to expect during each stage can help you feel more prepared and connected to your growing baby. Here’s a week-by-week guide to each trimester.
First Trimester (Weeks 1-12)
The first trimester is a time of rapid development for your baby and significant changes in your body.
Week 1-4: Conception and Implantation
- What Happens: Fertilization occurs, and the fertilized egg implants itself in the uterine lining. The placenta begins to form.
- Symptoms: Missed period, fatigue, nausea, and tender breasts.
Week 5-8: Early Development
- What Happens: Major organs, including the heart and brain, start forming. By week 6, the heart begins to beat.
- Symptoms: Morning sickness, heightened sense of smell, and mood swings.
Week 9-12: Fetal Growth
- What Happens: The baby’s features, such as fingers, toes, and facial features, begin to develop. By week 12, the baby is about 2.5 inches long.
- Symptoms: Nausea may continue, along with bloating and mild cramping. Many women see the beginnings of a baby bump.
Second Trimester (Weeks 13-27)
The second trimester is often considered the most comfortable stage of pregnancy as many early symptoms subside.
Week 13-16: Growth and Movement
- What Happens: Your baby’s skeleton develops, and you may start feeling flutters of movement (quickening) by week 16.
- Symptoms: Increased energy, reduced nausea, and possible round ligament pain as your uterus expands.
Week 17-20: Gender Reveal
- What Happens: The baby’s gender can often be identified through an ultrasound. The baby’s movements become more noticeable.
- Symptoms: Backaches and stretch marks may appear as your belly grows.
Week 21-27: Developing Senses
- What Happens: The baby’s hearing develops, and they can respond to sounds. Lungs and other vital organs continue to mature.
- Symptoms: Heartburn, leg cramps, and swelling in the ankles or feet.
Third Trimester (Weeks 28-40)
The final stretch of pregnancy is all about preparation for delivery and your baby’s final growth spurt.
Week 28-32: Rapid Growth
- What Happens: Your baby gains weight quickly, and their movements become more pronounced. Their eyes can open and close.
- Symptoms: Braxton Hicks contractions, shortness of breath, and increased fatigue.
Week 33-36: Getting Ready
- What Happens: The baby’s bones harden, and they settle into a head-down position in preparation for birth.
- Symptoms: Frequent urination, difficulty sleeping, and pelvic pressure.
Week 37-40: Full Term
- What Happens: The baby is considered full term by week 37. They continue to grow, and their lungs mature for breathing outside the womb.
- Symptoms: Increased discomfort, nesting instinct, and signs of labor such as losing the mucus plug or regular contractions.
When to Call Your Doctor
Throughout your pregnancy, stay in close communication with your healthcare provider. Seek immediate medical attention if you experience:
- Heavy bleeding or severe abdominal pain.
- Decreased fetal movement.
- Signs of preterm labor, such as regular contractions before 37 weeks.
- Severe headaches, vision changes, or sudden swelling (possible signs of preeclampsia).
