Pulmonary Maturity & Fetal Engagement
Educational content only — not medical advice.
Embryonic Age: 34 weeks post-fertilization — Lungs and digestive tract reach near-complete functional maturity. The fetus typically assumes a vertex cephalic presentation, descending into the pelvic inlet.
Biometric Measurements
- Approximate Length: 47.4 سم (CRL/CHL - INTERGROWTH-21st)
- Estimated Weight: 2.6 كجم (Hadlock)
- Fundal Height: 36 cm
- Size Comparison: Cantaloupe / Papaya
Key Fetal Milestones
- Alveolar sac maturation confirmed by lecithin-sphingomyelin ratio (L/S > 2.0)
- Significant subcutaneous white adipose tissue accumulation for neonatal thermogenesis
- Shedding of the majority of lanugo hair into the amniotic cavity
Maternal Changes
The fundus touches the sternal xiphoid process (36 cm), then lightens as engagement occurs, relieving breathing while increasing bladder frequency.