历史上的帝王后宫佳丽三千，为何有的帝王子嗣单薄？
为什么古代的皇子容易夭折？
推荐回答（5个）
清朝的帝王中，只有康熙生了三十五个儿子外，其他皇帝孩子都寥寥无几，每一代都比每一代少，呈现一种递减状态。在皇位传到同治的时候，也就自己一个人选了，在同治登基以后，祖宗香火几乎就快没有了。
咸丰皇帝当时结婚算是早的了，十几岁就已经成家了。在当上皇帝之后，后宫佳丽三千。虽然只活到31岁，但是还有十几年时间去造娃呢。最后只和慈禧生出一个孩子，虽然后宫女人中，也有怀孕的也有出生的，怀孕的没等出生就流产了，出生的没过满月就夭折，活的最长时间的也就是一年。唯独只有和慈禧的爱情结晶，一直活了下来。
皇宫佳丽三千，皇帝的子嗣应该非常多才对，可事实上，皇上的子女非常有限，而且存活率也非常低，从古装剧里我们也可以看出，后宫女人生个孩子似乎是一件非常困难的事情。
妃子本身的问题。比如有不孕的症结，又或者是同皇帝行房时未处在生理排卵期，皇帝可以选妃子同寝，妃子却不可以选皇帝，就算来了大姨妈也不行。皇帝自身的问题。皇帝也是凡人，后宫妃子那么多他哪能宠幸得过来，房事做多了会肾虚，会精子质量下降，身体会出毛病。再说皇帝日理万机，又不是造人机器。
古代医疗技术不比现在，恶疾流行，发烧感冒也可能死人，很多皇子生下来后都夭亡了。近亲结婚，导致无生育能力。典型的清朝最后三个皇帝。后宫之中的勾心斗角，争宠暗斗，用麝香或者藏红等药物致使她人流产滑胎；另外皇帝也会斟酌，为了平衡妃子权贵的权利，防止后宫干政就不予行房。
古代的皇子虽然衣食无忧，但是处在复杂的宫廷生活里面。帝王子嗣之间容易出现争斗的情况，夭折也会出现。
古时候的皇子不仅会因为当时的低下医疗程度在幼时就早要，而且还会因为宫斗时的各种内乱而造成英年早逝。
因为古代的皇子就是皇位的继承人，这样就会导致皇子的处境其实非常危险，他们很容易就被谋杀。很多皇子在很小的时候就夭折了，其实是死于宫斗。
有的皇帝的身体不好，所以子嗣单薄，而且后宫嫔妃争宠的手段特别残忍，很多未出世的皇子，在争宠斗艳中直接胎死腹中。
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