这些人都经历过难产，也就意味着她们的胎儿过大或者胎位不正不能从产道生产。
All had suffered from obstructed labor, meaning that their babies were too big or in the wrong position to pass through the birth canal.
如果你年过35岁，胎儿过大，或怀孕超过40周，VBAC对你而言仍然是安全的，但是这些情况还是会降低你自然分娩的机会。
VBAC is considered safe if you are older than 35, you have a large fetus, or your pregnancy goes beyond 40 weeks. But these things do lower your chance of being able to deliver vaginally.
总体看来，这些结论表明胎儿糖皮质激素受体基因的甲基化是由于母亲压力过大引起的，并且其影响将会持续到青春期。
Taken together, these results suggest that glucocorticoid-receptor-gene methylation happens in the fetus in response to a mother's stress, and persists into adolescence.
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