[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

孕早期(1-12周)胎儿铁需求尚低,若无贫血一般无需专门补铁,过量铁反而加重妊娠反应;孕中晚期(20周后)血容量扩张、胎儿储铁需求增加,是补铁的关键窗口期

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