Answer by
CopingWithLife (264)
The measurment range (crown to rump) length of a baby at nine weeks gestation is between 20-30mm. This equates to roughly 0. 9 inches to 1. 2 inches crown to rump length. Another fun fact is that, at this stage gestation, the baby will weigh an average of 2 grams, or. 07 oz. Small little baby that already has a beating heart!