Crown Rump Length Chart And Measurement
Note that the gestational age is different from the fertilisation age.
However, you should not rely on it completely as it is only an approximation.
The distal femoral epiphysis becomes echogenic in the third trimester and is separated from the distal end of the diaphysis, the osseous portion of the shaft.
A normal heartbeat at 6-7 weeks would be 90-110 beats per minute.