INFO:

分娩时胎儿最先进入母体骨盆入口的部分叫先露，大多数胎儿是头朝下，臀朝上的姿势，即头位胎儿。头位胎儿以顶先露最常见，分娩时头部最先伸入骨盆，这种胎位分娩时一般会比较顺利。不过有些胎儿虽然也是头部朝下，但是由于胎头过度俯屈、仰伸或者胎儿枕骨在母

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胎儿顶先露是什么意思

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