I realize that the question about a space of nine years between children was answered by the possibility of the first wife dying and acquiring a second wife. When that is not the circumstance, such as with an intact marriage, it could be a case of Rh incompatibility in which case, an Rh Negative Mom could have developed antibodies against Rh Positive blood exposure in one of her early pregnancies. Although often subsequent children who have Rh positive blood factor might be born and develop jaundice, die after birth, or be retarded, in extreme cases, the developing infant could be aborted naturally because of the Mom's overactive immune system. Just a thought. Gretchen Leisen