WEEK 36Trimester 3•Baby: Honeydew Melon / Romaine Lettuce
Near-Term Maturation & Group B Strep Milestone
Estimated Length47.4 cm
Estimated Weight2.60 kg
Fetal Morphogenesis & Anatomy Highlights
- •Lungs nearly fully mature with adequate lecithin-to-sphingomyelin ratio and phosphatidylglycerol in amniotic fluid.
- •Fetal liver accumulating glycogen reserves and iron stores for early neonatal life.
- •Lanugo hair shedding into amniotic fluid; swallowed and incorporated into meconium.
- •Fetal head descends into pelvic brim in nulliparous women ('lightening' or engagement).
Same-Day Assessment / Urgent Care
Week 36 Urgent Red Flags
Immediate clinical evaluation or presentation to Winnipeg Obstetric Triage (HSC / St. Boniface) is indicated if:
- •Spontaneous rupture of membranes (amniotic fluid leakage) - note color (clear vs green/meconium)
- •GBS positive with PROM (requires immediate presentation to L&D for IV antibiotic timing)
- •Constant severe abdominal pain or uterine rigidity (placental abruption)
Women's Hospital HSC Triage: 204-787-8600 | St. Boniface: 204-237-2263
Clinician Perspective • Physiological & Screening Protocols
Maternal Physiological Adaptations
Cervix begins subtle softening (ripening) in response to prostaglandins and relaxin.
Expected Clinical Symptoms
Lightening: breathing becomes easier, but pelvic/bladder pressure markedly increasesPelvic shooting pains ('lightning crotch') from fetal nerve pressureFrequent cervical mucus dischargeWaddling gait
Clinical Investigations & Screening Schedule
- ✓Group B Streptococcus (GBS) Screening (35w0d to 37w6d): universal rectovaginal swab.
- ✓Clinical implication: if GBS positive, intrapartum antibiotic prophylaxis (IV Penicillin G or Cefazolin/Clindamycin/Vancomycin based on susceptibility) indicated at onset of active labour or rupture of membranes.
- ✓Fetal presentation assessment (Leopold maneuvers +/- ultrasound). If breech, discuss External Cephalic Version (ECV) eligibility at ~37 weeks.
Upcoming Visit Horizon: Weekly prenatal visits begin (36, 37, 38, 39, 40 weeks).