Baby development at week 17
Adipose tissue starts for temperature regulation later. Sweat glands form. The skeleton continues replacing cartilage with bone.
Average size estimates for week 17 are about 13.0 cm and 140 g — roughly pear. Your ultrasound report and clinician’s dating override any website average.
What you might feel
You may feel more “pregnant” in your center of gravity. Supportive shoes and slower sit-to-stand habits help.
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
Track water more intentionally as blood volume rises — Preglo’s goal dial keeps it frictionless.
Also useful: due date calculator · all weeks · Preglo features
Nearby weeks: Week 15 · Week 16 · Week 18 · Week 19
Educational averages only — not medical advice. Contact your clinician for symptoms that worry you, bleeding, severe pain, or reduced movements.