WEEK 40Trimester 3•Baby: Small Pumpkin
Estimated Due Date (EDD) Arrival
Estimated Length51.2 cm
Estimated Weight3.50 kg
Fetal Morphogenesis & Anatomy Highlights
- •Fetus is fully prepared for atmospheric transition; placenta continues to provide adequate gas exchange and nutrition.
- •Fetal head molding allows passage through maternal pelvis; anterior and posterior fontanelles open.
- •Vernix mostly absorbed; skin may exhibit minor peeling or desquamation.
- •Average term birth weight: 3200–3600 grams.
Same-Day Assessment / Urgent Care
Week 40 Urgent Red Flags
Immediate clinical evaluation or presentation to Winnipeg Obstetric Triage (HSC / St. Boniface) is indicated if:
- •Oligohydramnios (MVP < 2 cm)
- •Non-reactive NST or BPP score <= 6/10
- •Meconium-stained amniotic fluid
Women's Hospital HSC Triage: 204-787-8600 | St. Boniface: 204-237-2263
Clinician Perspective • Physiological & Screening Protocols
Maternal Physiological Adaptations
Only ~4% of babies deliver on their exact calculated EDD; 90% deliver between 37w0d and 41w6d.
Expected Clinical Symptoms
High emotional anticipationFrequent strong contractionsCervical dilation and effacementFatigue
Clinical Investigations & Screening Schedule
- ✓Biweekly post-dates surveillance begins (SOGC guidelines).
- ✓Non-Stress Test (NST) and Biophysical Profile (BPP) with Amniotic Fluid Index (AFI / Maximum Vertical Pocket MVP >= 2.0 cm).
- ✓Discussion of post-term induction scheduling.
Upcoming Visit Horizon: Post-dates assessment at 40+3 to 40+5 weeks.