短暂性新生儿肌无力是产妇重症肌无力的罕见并发症。
大约 10-15% 的母亲所生的孩子具有抗乙酰胆碱受体 (AChR) 抗体，较少出现抗肌肉特异性激酶 (MuSK) 抗体。
症状通常从出生后第三天开始明显，几乎所有病例都会出现双侧面部麻痹和吸吮困难。症状通常在一个月大时消失。
然而，在一小部分患者中，由于针对胎儿 γ 亚基的抗体（在成人中被 ε 亚基取代），可能会出现更严重的情况，包括胎儿关节弯曲和持续到成年的球面麻痹，称为胎儿 AChR 失活综合征。
在发育的关键时期暴露于特定抗体会导致受体失活。
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