06/19/2021
If you were told this, you were likely lied to.
Yes, even if your grandmother was told this, and then your mother, and then you. Just because someone said it doesn't make it true. It may have just made their job easier.
Except in cases where there has been previous damage to the pelvis (like broken bones from an accident) or a deformity (due to a disease like Rickets), your body WILL birth your baby if given enough time and the ability to move into the right positions (and, in rare cases, a little assistance).
When a provider says a pelvis is too small, they are usually referring to Cephalopelvic Disproportion (CPD). CPD means that a baby's head is too large to fit through the mother's pelvis. True CPD is incredibly rare and super difficult to determine.
Most of the time a diagnosis of CPD is given with absolutely no basis for the statement.
Once in a while a series of measurements called “pelvimetry” is used to determine the size of the pelvic outlet to see if the baby will fit. These measurements are basically useless, however, since they can’t account for the fact that your pelvis expands by up to 30% during birth, and your baby’s skull plates slide over one another to fit the space (forming a cone). You also can’t know a baby’s size before birth, since late term ultrasounds are notoriously inaccurate.
So, basically, they’re guessing.
More often than not, a diagnosis of CPD is due to lack of patience, an unnecessary induction, or other controllable circumstances. Many cases of “failure to progress” during labor are arbitrarily given a diagnosis of CPD.
Were you told that your pelvis was too small to birth your baby?