Babies Need Space When Passing Through Mother’s Pelvis
When we look at a human baby, and consider his/her mother’s pelvis, it seems impossible for one to pass through the other.
Not so, if the baby has his back toward mother’s front –preferably her left.
He is able to curl forward and slide under her sacral prominence—the large bone at the top of the sacrum. To do so his head must lie in a lateral position with his face toward her right hip. As he descends he turns—his chin tucked well down his chest- until the top of his head is touching the back wall of her pelvis, and his shoulders lie across and inside the entrance to the pelvis so that his body lies in a transverse position in mother’s abdomen.
Now, his head is able to pass out the fully dilated cervix into the vagina, or birth canal.
The uterus, having had a rest, changes it’s action The contractions become expulsive, and he is pushed further out of his home. There should be no need for maternal pushing if he is properly lined up.
Once his head has emerged, he makes a quarter turn to allow his shoulders to pass between the ischial spines. Now, if mother is in an upright posture, legs well away from her body, his posterior shoulder is born, followed by his body, and he lies, face down, ready for any fluids in nose or mouth to drain.
If a baby starts the journey while facing forward, he is unable to bring his head under the sacrum until labour contractions bring his bottom forward. Because the contraction pressure is into the lower uterine segment instead of on the cervix, his membranes usually rupture early, making moving even more difficult. When he does get into mother’s pelvis, he is unable to use the space at the back without becoming a face presentation. This is very bad for his neck, and really tedious for mother.
If he continues in the upright or “military” position the common “back labour ” with the need for help ensues.
Babies, like all live born young have a built in pattern that makes birth as safe and simple as possible. Once we understand “How the parts fit” we are able to help most mothers and babies to a straightforward process and at the same time gain great satisfaction ourselves.