ETA: Didn't notice that several other posters had also answered this question, sorry...
Sometimes, if the mother has a full bladder at the start of labour, the descent of the head can "pinch" it and prevent it emptying fully.
It is often a good idea to go to the toilet regularly, if you are able, during labour, for that reason - to try and keep your bladder relatively empty. And keep drinking, too, to prevent you getting too dehydrated.
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