Can a baby be too big for your pelvis?
If you’re on the petite side, or if you’re expecting a larger baby, or if you’re a first-time mother-to-be, you might hear a great deal about babies being too big to fit through the pelvis or birth canal. When a baby cannot fit through the pelvis, this is called cephalopelvic disproportion (or CPD for short).
When a baby’s head is too large to fit through the mother’s pelvis?
Some consider this to be a form of cephalopelvic disproportion. However, it is distinct from what may be referred to as “true cephalopelvic disproportion,” in which the baby’s head is too large to easily fit through the pelvis, regardless of position (7).
How big is too big for a baby’s head?
The simple definition of the word macrocephaly is “large head.” Doctors apply that diagnosis when a baby’s head size is in the 98th percentile. This means that the baby’s head is bigger than 98% percent of other babies of the same age. Sometimes, doctors detect macrocephaly during an ultrasound before the baby is born.
When should I be concerned about my baby’s head size?
Pediatricians usually measure head circumference only in children under the age of 2, since the head doesn’t grow much after the fontanelles (soft spots) close at around 18 months. Again, head size is mostly genetic — so if you or your partner has a small head, your child may have a petite one too, and vice versa.
How do I know if my baby will fit through my pelvis?
When you are getting close to delivery, your physician will also determine if your baby will be able to fit with one other method. They will use an estimated fetal weight of you baby and compare that to the size of your pelvis. If your baby is estimated to be 5kg or more, a c-section will be recommended.
How do doctors know if baby is too big?
Measuring your fundal height: Your doctor will measure your fundal height (the height of your growing uterus). If your belly is measuring larger than expected for how far along you are supposed to be, then you may be carrying a large baby.
Can a small woman deliver a big baby?
Can I vaginally deliver a big baby? Many women are able to vaginally deliver a big baby. Even women who we perceive as “small” have very adequate space in their pelvis to fit a baby. Your doctor or midwife can determine your pelvic space during a vaginal exam in the very beginning of your pregnancy.