这里都没有这种讲法吧。
国内老人可能会觉得不好，不过B超是用超声波scan的，所以是没有辐射的。我也问过我妈妈，她是医生，也觉得问题不大。我现在快8个月，每次产检都做了的

目前没有明显证据证明超声产检对胎儿有害
随手搜了几篇近期的journal paper 给mm看看，不用太担心，只要是正常操作仪器。而且这里每次常规产检的b超只有几分钟的时间。


[Obstetrical ultrasound: can the fetus hear the wave and feel the heat?].
Ultraschall Med. 2012 Jun;33(3):215-7. doi: 10.1055/s-0032-1312759. Epub 2012 Jun 14.
http://www.ncbi.nlm.nih.gov/pubmed/22700164
。。。ConclusionWhile ultrasound is a sound wave which can produce mechanical effects and temperature elevation in tissues that it traverses, the risk to human fetuses when using diagnostic ultrasound appears to be minimal if certain rules are followed, such as performing a scan when medically indicated, and observing the ALARA principle (using the lowest output power consistent with acquiring the necessary diagnostic information and keeping the exposure time as low as possible for accurate diagnosis).



Benefits and risks of ultrasound in pregnancy.
Semin Perinatol. 2013 Oct;37(5):295-300. doi: 10.1053/j.semperi.2013.06.004.
http://www.ncbi.nlm.nih.gov/pubmed/24176149
abstract里面摘抄的：
。。。As is the case with almost any medical procedure, however, its performance carries some risks: misdiagnosis on the one hand and possible undesired effects on the other. The general belief exists that diagnostic ultrasound (DUS) does not pose any risk to the pregnant patient nor to her fetus. Nonetheless, ultrasound is a form of energy and, as such, demonstrates effects in biological tissues it traverses (bioeffects). The physical mechanisms responsible for these effects are thermal or non-thermal (mechanical). It is the role of science to show whether any of these bioeffects may be harmful. A risk-benefit analysis may also be important, as well as education of the end users to assure patients' safety.

哈哈谢谢你好厉害
赞这种research的思维

好的，谢谢！
我妈妈老一辈的想法不一样，我又不能太违背她唉

那你下次产检就别带她去
和老公去，然后告诉她一切正常，即可。

那是国内资源有限
医院没有足够资源给每个孕妇每次都做B超 并不是因为做多了不好