The placenta is a temporary organ that develops in the uterus during pregnancy, forming where the fertilized egg implants. It serves as a lifeline for the developing baby, facilitating the transfer of oxygen and nutrients from the pregnant individual’s bloodstream, while also removing waste products. This organ produces hormones that regulate maternal and fetal physiology, sustaining the pregnancy. The placenta can attach to various locations within the uterus, all considered normal variations.
Defining Anterior Placenta
An anterior placenta is a common and normal placental position where the organ implants on the front wall of the uterus, situated between the baby and the pregnant individual’s abdominal wall. This contrasts with a posterior placenta, which attaches to the back wall of the uterus. The location of the placenta is typically determined during a routine ultrasound scan, often referred to as an anatomy scan, performed between 18 and 21 weeks of pregnancy. During this scan, healthcare providers also identify the exact position of the placenta.
The placenta forms wherever the fertilized egg initially attaches to the uterine wall. In up to 50% of pregnancies, the placenta will be in an anterior position. An anterior placenta functions as effectively as a placenta in any other position, providing nourishment and support to the growing baby. Its placement does not inherently indicate a problem with the pregnancy or the baby’s health. While the placenta’s position is usually established by mid-pregnancy, it can appear to “move” upwards as the uterus expands, though it does not physically detach and relocate.
Experiencing Pregnancy with an Anterior Placenta
For individuals with an anterior placenta, the most noticeable difference during pregnancy often relates to the perception of fetal movements. Because the placenta acts as a cushion or a buffer between the baby and the pregnant individual’s abdomen, movements may feel softer or be detected later in the pregnancy. Many people with an anterior placenta may not feel distinct movements until after 20 weeks of pregnancy, whereas those with a posterior placenta might feel them earlier, around 17-19 weeks. This cushioned sensation does not mean the baby is moving less; it simply means the movements are less perceptible.
Beyond fetal movement perception, an anterior placenta has no impact on labor, delivery, or the likelihood of needing a C-section. It is important to distinguish an anterior placenta from placenta previa, a separate condition where the placenta partially or completely covers the cervix. While an anterior placenta can be associated with placenta previa, the anterior position itself does not cause this complication, and placenta previa is a different concern that requires specific monitoring.