End of First Trimester & External Genitalia Differentiation
Educational content only — not medical advice.
Embryonic Age: 10 weeks post-fertilization — Marks the end of the first trimester. Facial features refine with forward-migrated eyes, and fetal kidneys begin producing urine into amniotic fluid.
Biometric Measurements
- Approximate Length: 5.4 سم (CRL/CHL - INTERGROWTH-21st)
- Estimated Weight: 14 جم (Hadlock)
- Fundal Height: 12 cm
- Size Comparison: Lime / Plum
Key Fetal Milestones
- Genital tubercle differentiation into male/female structures
- Onset of swallowing and primitive sucking reflex
- Primary ossification centers expand across cranial and long bones
Maternal Changes
The uterine fundus rises just above the pubic symphysis, palpably detectable abdominally and audible via handheld Doppler ultrasound.