The First Trimester of Pregnancy is the first 12 weeks of pregnancy (week 1–12). It is a very important stage because the baby’s major organs and body systems start forming.
1. Duration
From week 1 to week 12 of pregnancy.
2. Major Development of the Baby
Fertilized egg implants in the uterus.
Formation of brain, spinal cord, and heart.
Heart usually starts beating around 5–6 weeks.
Arms, legs, eyes, and ears begin to develop.
By 12 weeks, the fetus has basic body structure.
3. Common Symptoms in Mother
Many women experience:
Nausea and vomiting (morning sickness)
Fatigue
Breast tenderness
Frequent urination
Mood changes
Loss of appetite or food cravings
4. Important Care During First Trimester
Start Folic Acid supplementation to prevent neural tube defects.
Eat a balanced diet rich in iron, protein, and vitamins.
Avoid alcohol, smoking, and unnecessary medications.
Take adequate rest.
5. Important Tests
Doctors usually recommend:
Blood tests (hemoglobin, blood group, infections).
Urine examination.
Early ultrasound such as Dating Scan around 6–8 weeks.
Screening tests like Nuchal Translucency Scan around 11–13 weeks.
6. Risk Period
The first trimester has the highest risk of miscarriage, so careful monitoring is important.
7. Warning Signs (Need Immediate Medical Care)
Vaginal bleeding
Severe abdominal pain
Persistent vomiting
Fever
