At 31 weeks, one could be 7 or 8 months pregnant depending on how the weeks are divided into months and you are well into the trimester.
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You may be noticing some changes to your breast at this stage.

31 weeks of pregnancy is how many months
When the woman is in her 31st week, it indicates that she is either in her 7th or 8th month of pregnancy.
Symptoms
During week 31, you may experience the following symptoms; breathlessness, frequent urination, leaky breasts, leg cramps and back pain, haemorrhoids and constipation.
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Baby Position
The ideal position for birth is the head down and the baby’s back towards your stomach, but there’s still plenty of time for the baby to turn if they are still in the breech position.
Baby Weight
At 31 weeks pregnant, the baby is as big as bunch asparagus. Baby is about 6.2 inches long and weighs about 3.3 pounds. The baby is probably crowding your lungs, which is why you might find yourself winded on a normal walk up the stairs.
Pressure
The extra weight of pregnancy often becomes more noticeable in the second trimester. As pregnancy progresses, the uterus puts more and more pressure on the lower body. As the pelvic floor weakens, this pressure can cause a feeling of fullness in the vagina or generalised pain and pressure in the hips and pelvis.

