WEEK 10Trimester 1•Baby: Prune / Kumquat
Transition from Embryo to Fetus
Estimated Length3.1 cm
Estimated Weight4 g
Fetal Morphogenesis & Anatomy Highlights
- •The embryonic period has officially ended; now designated a fetus.
- •Critical teratogenic vulnerability window for major structural anomalies is closing.
- •External genitalia begin subtle differentiation.
- •Fetal kidneys begin producing hypotonic urine, contributing to amniotic fluid.
Same-Day Assessment / Urgent Care
Week 10 Urgent Red Flags
Immediate clinical evaluation or presentation to Winnipeg Obstetric Triage (HSC / St. Boniface) is indicated if:
- •Significant vaginal bleeding with or without tissue passage
- •Severe persistent abdominal cramping not relieved by rest
- •Calf pain, swelling, erythema (Deep Vein Thrombosis risk elevated in pregnancy)
Women's Hospital HSC Triage: 204-787-8600 | St. Boniface: 204-237-2263
Clinician Perspective • Physiological & Screening Protocols
Maternal Physiological Adaptations
Maternal blood volume has increased by 10-15%. Heart rate increases by 10-15 bpm. Luteal-placental shift is complete.
Expected Clinical Symptoms
Uterine round ligament stretching (sharp groin twinges)Visible superficial vein dilation across breasts and abdomenConstipation due to progesterone
Clinical Investigations & Screening Schedule
- ✓Non-Invasive Prenatal Testing (NIPT / cfDNA) can be drawn starting at 10w0d (>99% sensitivity for Trisomy 21).
- ✓Baseline blood pressure and weight recording.
Upcoming Visit Horizon: 11w2d to 13w6d Nuchal Translucency (NT) & serum screening (Cadham Lab in Manitoba).