[KongchangAI]
Unverified85% confidenceCautionTime unknown

孕28周前不建议自行购买胎心监护仪,此阶段胎心波动大、易受体位干扰,家用设备频繁听诊反而增加焦虑;32周后或医生要求数胎动/做NST时再考虑

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