05/08/2026
📅 1️⃣ Your EDD is best established early in pregnancy
The first-trimester ultrasound , particularly the early dating scan, is the most reliable way to establish gestational age when LMP dates are uncertain.
👶 2️⃣ What does a later ultrasound actually measure?
In the 2nd & 3rd trimester, the machine measures your baby’s:
📏 Head measurements
📐 Abdominal circumference
🦴 Femur length
⚖️ Estimated fetal weight
🧠 3️⃣ The machine then compares these measurements with average babies of different gestational ages.
So, if your baby is measuring smaller than average, the machine may calculate a“younger gestational age” and display a different EDD.
⚠️ But that does NOT mean your baby has actually become younger! 😄
📊 4️⃣ Later ultrasound = GROWTH assessment, not re-dating!
The **weight percentile** tells us whether your baby is:
✅ Growing appropriately
📈 Small for gestational age
📉 Showing growth restriction
📊 Larger than expected
🎯 5️⃣ So remember:
Early scan → DATE the pregnancy 📅
Later scan → ASSESS growth & wellbeing 👶
❌ Don’t change your delivery date based only on a late-pregnancy ultrasound.
❤️ One pregnancy. One established EDD.
Trust the dating scan and let later scans do what they are meant to do—monitor your baby’s growth.
📌 Save this reel if you’re pregnant!
📤 Share it with every mom-to-be who has ever wondered, *“Why has my due date changed?”
Dr. Shweta Mathur | Obstetrician & Gynaecologist
📍 Srijan Clinic, Noida
Pregnancy & maternity care | Noida • Greater Noida West
PregnancyTips PregnancyEducation DatingScan FetalGrowth FetalGrowthScan PregnancyJourney MomToBe ExpectingMom Obstetrician Gynaecologist GynaecologistInNoida PregnancyCareNoida GreaterNoidaWest NoidaMoms NoidaPregnancy SrijanClinic DrShwetaMathur
