Baby's development
- Heart tube starts contracting.
- Neural tube — future brain and spinal cord — closes.
T1 · First TrimesterWeek 5 of 40
The embryo's heart tube begins to beat. Major organ systems start to form.
Progress13% · 35 weeks left
- Baby size
- Apple seed
- Length
- 0.2 cm
- Weight
- —
What's happening to you
- Missed period confirmed for most women.
- Nausea, frequent urination, mood swings may start.
Tips for this week
- Book your first prenatal visit (usually scheduled for weeks 6–10).
- Keep folic acid going — it protects the neural tube.