There is another birth in 1884, registered in ‘Balrothery’, which may also be a possibility.
Birth
Name: Robert White
Registration Quarter and Year: Jul - Sep 1884
Registration District: Balrothery
Volume Number: 2
Page Number: 369
But, if you do not have it already, I’d start with ordering the €4 copy of their marriage register from the General Register Office, to confirm the church where they married, as well as the fathers’ names and occupations. Details are:
Marriage
Name: Robert Whyte
Date of Registration: Jul-Aug-Sep 1911
Registration District: Dublin North
Volume: 2
Page Number: 461
It cross-matches with Louise Jeannette Wilmot, so seems likely.