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If you mean the abdominal circumference, it sometimes means the placenta is not working well and the baby may need to be delivered soon. If the placenta is not working as well as it should, the baby will grow "asymmetrically" and the head will grow at a normal rate because even the baby's body knows that it should be sending more good bood and nutrients to the brain, but then sometimes the other parts of the body aren't able to grow as well. Sometimes, these babies have more trouble during labor, so it's especially important to follow your doctor or midwife's advice.

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16y ago

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