If your baby's spine runs in the same direction (parallel) as your spine, the baby is said to be in a longitudinal lie.Your baby will most often settle into a position in the pelvis before labor begins. Your baby's spine is between their head and tailbone. This refers to how the baby's spine lines up with the mother's spine. However, engagement may happen later in the pregnancy, or even during labor. In first-time moms, the baby's head may engage by 36 weeks into the pregnancy. If the presenting part lies above the ischial spines, the station is reported as a negative number from -1 to -5.The baby is said to be "engaged" when the largest part of the head has entered the pelvis. This is when the baby's head is even with the ischial spines. Normally the ischial spines are the narrowest part of the pelvis. These are bone points on the mother's pelvis. Most often, it is the baby's head, but it can be a shoulder, the buttocks, or the feet. The presenting part is the part of the baby that leads the way through the birth canal. This position is called occiput anterior.Ĭertain terms are used to describe your baby's position and movement through the birth canal.įetal station refers to where the presenting part is in your pelvis. The best position for the baby to pass through the pelvis is with the head down and the body facing toward the mother's back. Certain body positions give the baby a smaller shape, which makes it easier for your baby to get through this tight passage. Your baby in the birth canal Shoulder presentation Malpresentations Breech birth Cephalic presentation Fetal lie Fetal attitude Fetal descent Fetal station Cardinal movements Labor-birth canal Delivery-birth canalĭuring labor and delivery, your baby must pass through your pelvic bones to reach the vaginal opening.
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