A posterior placenta is a placenta that has implanted onto the back wall of the uterus. This is the second most common location for the placenta, after anterior placentation. The position of the placenta can be determined by an ultrasound, usually at the 12-week and 20-week scans.

Here are some facts about a posterior placenta:

• A posterior placenta means that the baby is closer to your spine, so you may feel the baby’s movements earlier and stronger.
• A posterior placenta allows the baby to get into the most optimum position for birth, with the spine at the top of your belly.
• The blood flow at the back of the uterus can sometimes be less efficient due to that wall being longer and thicker, which may increase the chance of preterm labor.
• A posterior placenta is considered normal and is not associated with any significant risks.
• The posterior placenta location has been linked to more back pain for some women.

In summary, a posterior placenta is a normal placental position that is not associated with any significant risks. It allows the baby to get into the most optimum position for birth and may result in feeling the babys movements earlier and stronger.