U.S. doctors online nowAsk doctors free
Maryville, TN
A 24-year-old female asked:

Do all fetuses grow the same in the first trimester? poss for a fetus to grow small & date multiple weeks behind? ex actually be 12w, but date 8w?

1 doctor answer3 doctors weighed in
Dr. Jane Van Dis
Obstetrics and Gynecology 20 years experience
No: Most first trimester fetus' grow at the same rate. There would have to be a major structural abnormality (likely one that wasn't compatible with life) that would make it such that there was a 4 week lag. Trust that your ultrasound is right, your pregnancy is right and that there's nothing wrong with the dating.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Aug 15, 2013

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.