孕期知识：正常胎心率应该是多少？
每一次孕期检查都会让准父母既兴奋又紧张。
正常的胎心率应该是每分钟多少下呢？胎心率在整个孕期过程中是否会有变化？
我查了国外的资料，资料来源：
https://radiopaedia.org/articles/fetal-heart-rate
我把原文和中文翻译都张贴出来，供参考。
A normal fetal heart rate (FHR) usually ranges from 120 to 160 beats per minute (bpm) in the
in utero period. It is measurable sonographically from around 6 weeks and the normal range varies during gestation, increasing to around 170 bpm at 10 weeks and decreasing from then to around 130 bpm at term.
在宫内期正常胎心率通常是在每分钟120到160之间。从孕六周其能够通过超声检查检测到，大约第10周升高到每分钟170次，然后降低，到出生时候讲到每分钟130次。
Evolution through gestation
孕期胎心率的变化
it is first visible on sonography around 6 weeks of gestation. The FHR is then usually around 100 to 120 beats per minute (bpm).
六周时能够测到，每分钟100到120次。
FHR then increases progressively over the subsequent 2-3 weeks becoming:
在随后两周逐步升高
· ~110 bpm (mean) by 5-6 weeks；第5-6周达到每分钟110次左右
· ~170 bpm by 9-10 weeks；第9-10周达到每分钟170次左右
This is followed by a decrease in FHR becoming on average: 随后降低
· ~150 bpm by 14 weeks；第14周为每分钟150次
· ~140 bpm by 20 weeks；第20周每分钟140次
· ~130 bpm by term；足月为每分钟130次
Although in the healthy fetus the heart rate is usually regular, a beat-to-beat variation of approximately 5 to 15 beats per minute can be allowed.
健康的胎心率应该是有规律的，但每分钟差异在5-15次之间属于正常范围。
