满意回答
如果是降满亲妹妹： My younger sisiter is an infant. 如果是唐悠殊辉/表饥躬妹： My my younger female cousin is an infant.
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其他回答
My younger sisiter is an infant.
my sister is a baby.
如果是降满亲妹妹： My younger sisiter is an infant. 如果是唐悠殊辉/表饥躬妹： My my younger female cousin is an infant.
My younger sisiter is an infant.
my sister is a baby.