1The birth of a baby that has died in the womb.
2A birth in which the mother and any other people present are encouraged to refrain from making (excessive) noise during the birth of the baby.
The procedure is particularly associated with members of the Church of Scientology in the belief that any words or noise could have an adverse effect on the child in later life.
silent birth/ˌsʌɪlənt ˈbəːθ/ /ˌsʌɪl(ə)nt ˈbəːθ/
Early 20th century; earliest use found in Progress-Examiner (Orleans, Indiana). From silent + birth.