Unless you say otherwise I am assuming that you, personally, have no solid evidence ie. documents to support the information you are using............and no certificates relating to BDM events in this family?.
Everything is sourced verbally from family?
BDM WA birth
BELL Annie Victoria William / Louisa RILEY Canning 1920 / 1894
BELL Florence Norman William / Louisa Florence RILEY Fremantle 761 / 1896
BELL Olive May William / Louisa Florence RILEY Fremantle 1784 / 1898
BELL Stillborn male William / Louisa Florence RILEY Fremantle 1992 / 1900
BELL George Axton William / Louisa RILEY Perth 4527 / 1902
BELL Grace Florence William / Louisa Florence RILEY Fremantle 2810 / 1903
death
BELL Annie Victoria 8w William / UKN birthplace UKN 982 / 1895
BELL Florence Normon 3d William / Louisa Florence RILEY Fremantle 797 / 1896
BELL George Axton 6m William / Louisa RILEY Perth 2496 / 1902
Is this your family?. Do you have any other children born to this couple?.
If you are wanting to research the origins of William BELL m. 1891 you need to get the marriage certificate.