11/22/2025
Placenta 101: here are six fascinating placenta variations your provider might mention and what they actually mean:
1. Bipartite Placenta
A placenta made of two equal-sized lobes instead of one. Theyāre connected by membranes, and the cord typically attaches to just one lobe. Most pregnancies are uncomplicated, but providers pay attention at delivery to ensure both lobes separate cleanly.
2. Circummarginate Placenta
A mild variation where the membranes attach slightly inward from the edge, creating a smooth āraisedā border. It usually carries little to no increased risk and is often just an incidental ultrasound finding.
3. Battledore Placenta (Marginal Cord Insertion)
The umbilical cord inserts right at the edge of the placenta instead of the centerākind of like a paddle. Most pregnancies with battledore placentas are healthy, but itās often monitored because it can sometimes affect blood flow.
4. Velamentous Cord Insertion
Here, the cord attaches to the membranes instead of the placenta itself, leaving fetal vessels unprotected. Itās rare, but providers monitor it closely because it can be associated with vasa previa or growth concerns. Early detection = safer planning.
5. Succenturiate Lobe
A small āaccessoryā lobe separate from the main placenta. Most pregnancies are unaffected, but itās important at delivery since these smaller lobes can occasionally stay behind and increase the risk of postpartum bleeding or infection.
6. Circumvallate Placenta
A variation where the placentaās edges fold upward, creating a thicker, raised rim. Research is mixed, but some studies note higher rates of bleeding, preterm birth, or growth restrictionāso providers often follow it a bit more closely.
⨠Normal vs. Not?
Many placenta variations never cause problems at all. What matters most is understanding what your specific placenta looks like and how your provider plans to monitor it.
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