Situation: A 26-year-old primigravida at 39 weeks' gestation is admitted to the labor room of a district hospital. The hospital monitors labor with the traditional modified World Health Organization (WHO) partograph used in the Department of Health (DOH) Essential Intrapartum and Newborn Care (EINC) module, which starts plotting the active phase at 4 cm of cervical dilation. Her membranes are intact, and her prenatal course was uncomplicated. On admission at 08:00, vaginal examination shows the cervix 4 cm dilated with the vertex presenting. The examiner feels the diamond-shaped fontanel toward the mother's left and posterior. How should the nurse classify the fetal position?

The diamond-shaped fontanel is the anterior fontanel, at the front of the fetal head, so the occiput lies at the opposite point. With the anterior fontanel toward the mother's left posterior pelvis, the occiput points to her right anterior pelvis. The position is therefore right occiput anterior.

Fetal position interpretation
The examiner palpated the diamond-shaped fontanel, which is the anterior fontanel. Because the anterior fontanel sits at the front of the fetal head, the occiput is always located at the opposite point of the skull. When the anterior fontanel is felt toward the mother’s left posterior pelvis, the occiput must therefore point toward the mother’s right anterior pelvis. The fetal position is named by the direction of the occiput, not by the fontanel that is palpated.

In this case, the occiput is directed to the maternal right and anterior, so the position is right occiput anterior (ROA). The vertex is presenting, and the occiput is the landmark used for describing cephalic positions. Key point! If the examiner feels the anterior fontanel, mentally rotate 180 degrees to locate the occiput before naming the position.

Why this matters in labor
Occiput anterior positions are the most favorable for vaginal delivery because the fetal head presents with the smallest diameter and rotates through the pelvis most efficiently. In contrast, occiput posterior (OP) positions are the most common malposition and are associated with prolonged labor, operative delivery, and cesarean section ^[1]. The active phase of labor tends to be longer with OP than with OA positions ^[2]. OP may complicate up to 35% of initial labors, although many fetuses rotate spontaneously to an anterior position during labor ^[3].

The traditional modified WHO partograph used in the DOH EINC module begins active-phase plotting at 4 cm of cervical dilation. Accurate identification of fetal position at admission helps the nurse anticipate labor progress and recognize when a persistent malposition may be contributing to slow dilation or descent. Digital examination remains the conventional bedside method for assessing fetal position, though intrapartum ultrasound and deep learning models are being studied to improve accuracy ^[1][4].

Watch out! Do not confuse the side of the fontanel with the side of the occiput. The anterior fontanel and the occiput are on opposite sides of the fetal head. If the anterior fontanel is left posterior, the occiput is right anterior, making the position ROA, not LOP or LOA.