Baby development at week 16
Eye movement increases. The nervous system wires rapidly. Some experienced parents feel early flutters; first pregnancies often feel them later.
Average size estimates for week 16 are about 11.6 cm and 100 g — roughly apple. Your ultrasound report and clinician’s dating override any website average.
What you might feel
Round ligament pain, nasal congestion, or mild shortness of breath can appear with blood-volume changes.
You are in the second trimester. Two pregnancies at the same week can feel completely different — treat these notes as orientation, not a checklist you must match.
What to track this week
- Symptoms, mood, sleep, and energy in your daily log
- Water intake toward a simple daily goal
- Appointment dates and questions for your care provider
A calm next step in Preglo
If you feel something flutter-like, jot the time in notes — it becomes a sweet timeline later.
Also useful: due date calculator · all weeks · Preglo features
Nearby weeks: Week 14 · Week 15 · Week 17 · Week 18
Educational averages only — not medical advice. Contact your clinician for symptoms that worry you, bleeding, severe pain, or reduced movements.