A–Z Glossary

Crown-rump length

Crown-to-rump length measures an embryo or fetus from the top of the head to the bottom of the torso.

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Ultrasounds and monitoring baby growth by trimester

Ultrasounds and monitoring baby growth by trimester

Why ultrasound is used differently across pregnancy Ultrasound is a flexible imaging tool, but it is not used in the same way throughout pregnancy. Early on, the priority is confirming intrauterine pregnancy and dating gestational age as accurately as possible. Mid-pregnancy scans focus on fetal anatomy and provide an important reference point for subsequent growth […]

Baby size and fetal development milestones by trimester

Baby size and fetal development milestones by trimester

Understanding pregnancy dating and fetal size measurements Pregnancy is usually dated from the first day of the last menstrual period, even though conception typically occurs about two weeks later. This is why a person who is described as 8 weeks pregnant has usually had about 6 weeks of embryonic or fetal growth. Early ultrasound can […]