Is there any references to premature birth and astrology?? like any specific dasa or planetary state that induced premature birth or its just happened what needed to happen?? If yes, can we say there is disturbance on natural cycle of birth?? and can the chart of that prematured birth native is not considered valid???, or we could argue despite of birth time the characteristic of the native be according to the birth time regardless of premature birth at 6 , 7 , 8 th month or a normal birth. Is there any references/ conditions for these???