Hi, Can anyone help?

I have found census records for Robert from 1841 - 1881 & have found his death registry but I can not find his birth regisrty & without that I can not find out who his father was.
His details are : Robert Rimmington

Birth: 1815 in Greetham, Lincolnshire, England

Death: Jun 1888, in Northamptonshire, Rutland, United Kingdom

Any help would be gratfully recieved
Cathy

GRO index has Robert Rimmington death at Stamford Lincs
jun 1888 age 74 ref 79 201

IGI birth for
Robert Rimington 13/3/1814 died 10/4/1814 Denton Lincs
Robert Rimington 26/6/1815 Denton Lincs

Parents to both Robert Rimington and Eleanor

There is a marriage on the IGI of Robert and Eleanor Wiseman 26/11/1807 Denton but this is 'submitted'