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What does the midwife mean by baby`s head `fixed`?

Im almost 34 weeks pregnant with my first and since about 31 weeks i have been having some groin/pelvic bone area discomfort. This does`nt happen all the time but i find myself walking like a cowboy when i get the achey pain `down there` - when i get this pain it can last up for a few hours to sometimes all day. I would not say that its extrememly painful or excruciating or anything like that.
I was wondering if what i am experiencing would have anything to do with the baby`s head being down as the midwife told me at my 33 week check up that the baby`s head is `fixed` and 1cm from being engaged?.

What does the midwife mean by baby`s head `fixed`? and how many 5ths would it be on the "fifth above brim" phrase???

Sarah...
Answer: Hi, This is more likely from the hormonal changes that occur later in pregnancy. It softens the cartilage in your pelvis in preparation for the birth. The baby’s head descent is measured in fifths. It is engaged when it is 3/5 or more below the brim of the pelvis. It can be stated as above or below the brim of the pelvis. If it is fixed it is probably 1 or 2/5 into the brim. Best wishes, Alex
Answered: 22 Sep 2008