The baby is measured from one end to the other crown-rump-length, or CRL. Information on pregnancy ultrasound scans including when they are taken, what it can be used for, dating scans, anomaly scans, plus links to trusted resources. Assess the size of your baby. However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment. Learn about what it looks for and when it is performed. Did you mean:
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Back to Your pregnancy and baby guide. Tell us a little bit about your child. Who would you choose to be your birth partner?