An ultrasound showing a fetus measured to have a<unk>  of 1.67 cm and estimated to have a gestational age of 8 weeks and 1 day<unk>  <unk>  is the measurement of the length of human embryos and fetuses from the top of the head <unk> own) to the bottom of the buttocks <unk> . It is typically determined from ultrasound imagery and can be used to estimate gestational age.
Crown-rump length
Amniotic fluid index
Weight and height percentile
Thyromental distance
Fetal movement
Krogh length
Fetal circulation
Growth landmarks