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There are two placentas, instead of one. Is this common?

Hi Alex,
I am 36 weeks pregnant with my first baby and at my last obs/gyno appointment my doctor noticed on the ultrasound that there were two placentas, instead of one. This is the first time it has been noticed and my doctor said that it is not uncommon for there to be two placentas or for the placenta to be in two parts and that they are joined with a blood vein. I have not heard of this before and am wondering what your thoughts were on this. Have you come across this in your experiences? Is this common?

Sarah...
Answer: Hi, It is quite common to have a succenturiate lobe to the placenta. This is where one part of the placenta grows separate to the main placenta but it is still joined by the arteries and vein of the placenta. This part still functions as the placenta. This condition really poses no risk to the mother and baby and the only thing that your carers need to ensure is that the extra lobe is expelled along with the main placenta at birth. This can cause problems if it is left in the uterus. Best wishes, Alex
Answered: 22 Jan 2009