Hadith.5661 - Hariz narrated from Al-Fudayl who said
Al-Hakam ibn Utaibah asked Abu Jafar Imam Muhammad ibn Ali Al-Baqir (as) about a child who is born from his mother without letting out a cry - does he inherit?
Imam (as) turned away from him. When he repeated the question, Imam (as) said:
"If the child moves with clear movement, he inherits, for it is possible that he may be mute."