Does the ultrasound show that the fetal head is in the pelvis?

During pregnancy, the fetus will slowly grow over time. After a certain growth cycle, some changes will begin to occur in the mother's abdomen. B-ultrasound shows that the fetal head position is a common phenomenon, but it is not a sign of engagement with the pelvis. Generally, the fetal head position occurs in the late pregnancy of women. The head position and engagement with the pelvis are not of the same nature, and more observation is needed.

Is the fetal head in the pelvis?

The fetal head is not in the pelvis. Fetal head position refers to the situation in which the fetus's head has turned to a downward position in the late pregnancy. The fetal head position is to prepare for normal delivery, and a fetus in head position is conducive to normal delivery. Corresponding to the fetal head position are fetal breech position and transverse position, which all mean that the fetal position is incorrect and the fetal head is not kept downward, which is not conducive to normal delivery. The fetus is in the pelvis when the top of the fetus's neck reaches below the entrance of the mother's pelvic cavity and the fetal head and pelvis are symmetrical, indicating that vaginal delivery is possible and the first step of the delivery process has been completed, laying a good foundation for a smooth delivery. The fetus usually enters the pelvis around 36 weeks of pregnancy, but some people do not enter the pelvis until just before delivery. So, the fetal head position is not in the pelvis.

Changes in the fetal head :

The fetal head position is closely related to the fetal development (growth). Because the head develops the fastest during pregnancy, the fetal head position is constantly changing; 8 weeks to 11 weeks: (embryo has just developed - development is complete) head position correction. 12 weeks (3 months) - 16 weeks: (The fetus's body and weight increase rapidly) The fetal head begins to tilt forward. 5 months (17 weeks - 20 weeks): The fetus' head tilts more forward. 7 months: The fetus' head is basically facing downwards. 9 months to 38 weeks: (The fetus has basically completed its development) The fetus' head is completely facing downwards (ready to be born).

Classification of fetal position:

The fetal position refers to the position of the presenting part in the maternal pelvis, that is, the four phases of the pelvis - left anterior, right anterior, left posterior, and right posterior.

The representative bone of vertex presentation is the occipital (abbreviated as O);

The representative bone of breech presentation is the sacrum (abbreviated as S);

The first presenting part is the mandible (mentum, abbreviated as M);

The representative bone of shoulder presentation is the scapula (abbreviated as Sc).

There are several classifications of fetal positions:

There are six types of vertex presentation: Left occipital anterior (LOA) Left occipital transverse (LOT) Left occipital posterior (LOP) Right occipital anterior (ROA) Right occipital transverse (ROT) Right occipital posterior (ROP)

There are six breech presentation positions: Left sacral anterior (LSA) Left sacral transverse (LST) Left sacral posterior (LSP) Right sacral anterior (RSA) Right sacral transverse (RST) Right sacral posterior (RSP)

There are six types of face presentation: Left Mental Anterior (LMA) Left Mental Transverse (LMT) Left Mental Posterior (LMP) Right Mental Anterior (RMA) Right Mental Transverse (RMT) Right Mental Posterior (RMP)

There are four shoulder presentation positions: Left shoulder anterior (LScA) Left shoulder posterior (LScP) Right shoulder anterior (RScA) Right shoulder posterior (RScP)

The difference between fetal head position and breech position:

Fetal movement is the movement of the fetus in the uterine cavity that impacts the uterine wall. Because the shapes of fetuses in the head position and breech position are different in the expectant mother's uterus, the fetal movement felt by the expectant mother will also be different.

Head position: The fetal movements are basically above the belly button, or on both sides. The lower abdomen basically does not move much, but you will feel something pressing against the bladder or anus.