Early ultrasound dating off
Errors in estimates of fetal age can lead to further errors, including iatrogenic prematurity, and unnecessary inductions.
Second, there’s a question of how long the pregnancy will last.
Therefore, my data for weeks 40 and 41 are only estimates, based on a bell curve format.
The standard definition for gestational term is 266 days from conception to the date of the baby’s birth.
Because visual representation of data is often helpful for illustrating a point, I have included a graph here illustrating the range of dates at which babies are born.
The following graph is intended as an illustration of approximately how many births occur within each week of pregnancy.