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河北读者杨慧英来电话问:书上说妊娠早期分为三个阶段。请问,胎儿在哪个阶段最易受到病毒或药物的影响而发生畸形呢?
Yang Huiying reader in Hebei called: the book said that early pregnancy is divided into three stages. I ask, which stage of the fetus most susceptible to the impact of viruses or drugs and deformity it?