International standards for early fetal size and pregnancy dating based on ultrasound measurement of crown–rump length in the first trimester of pregnancy - Papageorghiou - 2014 - Ultrasound in Obstetrics & Gynecology -
Is this normal size for baby crl | Mumsnet
PDF) Ultrasound Reference Chart Based on IVF Dates to Estimate Gestational Age at 6–9 weeks' Gestation
Measurement of CRL at (a) 6 weeks and (b) 13 weeks. | Download Scientific Diagram