[KongchangAI]
Unverified90% confidenceCautionTime unknown

孕20周前不建议自行购买使用家用胎心仪:此阶段胎心位置深、胎位不定,普通人极难找准,反复找不到心跳容易引发焦虑,且可能误将母体腹主动脉搏动(约70-90次/分)当作胎心(正常胎心110-160次/分)

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